[0] 0.142.237.104.in-addr.arpa.: domain name does not exist
[86400] 1.142.237.104.in-addr.arpa. domain name pointer gw-li839.linode.com
[0] 2.142.237.104.in-addr.arpa.: domain name does not exist
[0] 3.142.237.104.in-addr.arpa.: domain name does not exist
[86400] 4.142.237.104.in-addr.arpa. domain name pointer li839-4.members.linode.com
[86400] 5.142.237.104.in-addr.arpa. domain name pointer li839-5.members.linode.com
[86400] 6.142.237.104.in-addr.arpa. domain name pointer ln84.endpoint.com
[86400] 7.142.237.104.in-addr.arpa. domain name pointer li839-7.members.linode.com
[86400] 8.142.237.104.in-addr.arpa. domain name pointer smtp.agile.st
[86400] 9.142.237.104.in-addr.arpa. domain name pointer li839-9.members.linode.com
[86400] 10.142.237.104.in-addr.arpa. domain name pointer li839-10.members.linode.com
[86400] 11.142.237.104.in-addr.arpa. domain name pointer mantis.phplist.org
[86400] 12.142.237.104.in-addr.arpa. domain name pointer li839-12.members.linode.com
[86400] 13.142.237.104.in-addr.arpa. domain name pointer mhload.michaelhyatt.com
[86400] 14.142.237.104.in-addr.arpa. domain name pointer li839-14.members.linode.com
[86400] 15.142.237.104.in-addr.arpa. domain name pointer li839-15.members.linode.com
[86400] 16.142.237.104.in-addr.arpa. domain name pointer li839-16.members.linode.com
[86400] 17.142.237.104.in-addr.arpa. domain name pointer li839-17.members.linode.com
[86400] 18.142.237.104.in-addr.arpa. domain name pointer li839-18.members.linode.com
[86400] 19.142.237.104.in-addr.arpa. domain name pointer li839-19.members.linode.com
[86400] 20.142.237.104.in-addr.arpa. domain name pointer li839-20.members.linode.com
[86400] 21.142.237.104.in-addr.arpa. domain name pointer li839-21.members.linode.com
[86400] 22.142.237.104.in-addr.arpa. domain name pointer li839-22.members.linode.com
[86400] 23.142.237.104.in-addr.arpa. domain name pointer li839-23.members.linode.com
[86400] 24.142.237.104.in-addr.arpa. domain name pointer li839-24.members.linode.com
[86400] 25.142.237.104.in-addr.arpa. domain name pointer li839-25.members.linode.com
[86400] 26.142.237.104.in-addr.arpa. domain name pointer wf-104-237-142-26.webfaction.com
[86400] 27.142.237.104.in-addr.arpa. domain name pointer li839-27.members.linode.com
[86400] 28.142.237.104.in-addr.arpa. domain name pointer li839-28.members.linode.com
[86400] 29.142.237.104.in-addr.arpa. domain name pointer li839-29.members.linode.com
[86400] 30.142.237.104.in-addr.arpa. domain name pointer li839-30.members.linode.com
[86400] 31.142.237.104.in-addr.arpa. domain name pointer li839-31.members.linode.com
[86400] 32.142.237.104.in-addr.arpa. domain name pointer li839-32.members.linode.com
[86400] 33.142.237.104.in-addr.arpa. domain name pointer li839-33.members.linode.com
[86400] 34.142.237.104.in-addr.arpa. domain name pointer li839-34.members.linode.com
[86400] 35.142.237.104.in-addr.arpa. domain name pointer li839-35.members.linode.com
[86400] 36.142.237.104.in-addr.arpa. domain name pointer quadrail.yptransportation.org
[86400] 37.142.237.104.in-addr.arpa. domain name pointer iris.ccac.edu
[86400] 38.142.237.104.in-addr.arpa. domain name pointer li839-38.members.linode.com
[86400] 39.142.237.104.in-addr.arpa. domain name pointer li839-39.members.linode.com
[86400] 40.142.237.104.in-addr.arpa. domain name pointer mx2.supplychain8.com
[86400] 41.142.237.104.in-addr.arpa. domain name pointer severn.wwwdotorg.org
[86400] 42.142.237.104.in-addr.arpa. domain name pointer li839-42.members.linode.com
[86400] 43.142.237.104.in-addr.arpa. domain name pointer li839-43.members.linode.com
[86400] 44.142.237.104.in-addr.arpa. domain name pointer li839-44.members.linode.com
[86400] 45.142.237.104.in-addr.arpa. domain name pointer ip-104-237-142-45.cloudezapp.io
[86400] 46.142.237.104.in-addr.arpa. domain name pointer ip-104-237-142-46.cloudezapp.io
[86400] 47.142.237.104.in-addr.arpa. domain name pointer li839-47.members.linode.com
[86400] 48.142.237.104.in-addr.arpa. domain name pointer li839-48.members.linode.com
[86400] 49.142.237.104.in-addr.arpa. domain name pointer li839-49.members.linode.com
[86400] 50.142.237.104.in-addr.arpa. domain name pointer li839-50.members.linode.com
[86400] 51.142.237.104.in-addr.arpa. domain name pointer li839-51.members.linode.com
[86400] 52.142.237.104.in-addr.arpa. domain name pointer li839-52.members.linode.com
[86400] 53.142.237.104.in-addr.arpa. domain name pointer li839-53.members.linode.com
[86400] 54.142.237.104.in-addr.arpa. domain name pointer stats15.linode.com
[86400] 55.142.237.104.in-addr.arpa. domain name pointer li839-55.members.linode.com
[86400] 56.142.237.104.in-addr.arpa. domain name pointer wf-104-237-142-56.webfaction.com
[86400] 57.142.237.104.in-addr.arpa. domain name pointer crawl3.overcast.fm
[86400] 58.142.237.104.in-addr.arpa. domain name pointer li839-58.members.linode.com
[86400] 59.142.237.104.in-addr.arpa. domain name pointer li839-59.members.linode.com
[86400] 60.142.237.104.in-addr.arpa. domain name pointer li839-60.members.linode.com
[86400] 61.142.237.104.in-addr.arpa. domain name pointer li839-61.members.linode.com
[86400] 62.142.237.104.in-addr.arpa. domain name pointer li839-62.members.linode.com
[86400] 63.142.237.104.in-addr.arpa. domain name pointer li839-63.members.linode.com
[86400] 64.142.237.104.in-addr.arpa. domain name pointer li839-64.members.linode.com
[86400] 65.142.237.104.in-addr.arpa. domain name pointer ip-104-237-142-65.cloudezapp.io
[86400] 66.142.237.104.in-addr.arpa. domain name pointer li839-66.members.linode.com
[86400] 67.142.237.104.in-addr.arpa. domain name pointer li839-67.members.linode.com
[86400] 68.142.237.104.in-addr.arpa. domain name pointer li839-68.members.linode.com
[86400] 69.142.237.104.in-addr.arpa. domain name pointer li839-69.members.linode.com
[86400] 70.142.237.104.in-addr.arpa. domain name pointer li839-70.members.linode.com
[86400] 71.142.237.104.in-addr.arpa. domain name pointer li839-71.members.linode.com
[86400] 72.142.237.104.in-addr.arpa. domain name pointer li839-72.members.linode.com
[86400] 73.142.237.104.in-addr.arpa. domain name pointer li839-73.members.linode.com
[86400] 74.142.237.104.in-addr.arpa. domain name pointer li839-74.members.linode.com
[86400] 75.142.237.104.in-addr.arpa. domain name pointer prevail.host
[86400] 76.142.237.104.in-addr.arpa. domain name pointer li839-76.members.linode.com
[86400] 77.142.237.104.in-addr.arpa. domain name pointer li839-77.members.linode.com
[86400] 78.142.237.104.in-addr.arpa. domain name pointer li839-78.members.linode.com
[86400] 79.142.237.104.in-addr.arpa. domain name pointer li839-79.members.linode.com
[86400] 80.142.237.104.in-addr.arpa. domain name pointer li839-80.members.linode.com
[86400] 81.142.237.104.in-addr.arpa. domain name pointer li839-81.members.linode.com
[86400] 82.142.237.104.in-addr.arpa. domain name pointer node.jnraptor.com
[86400] 83.142.237.104.in-addr.arpa. domain name pointer li839-83.members.linode.com
[86400] 84.142.237.104.in-addr.arpa. domain name pointer financialissues.vrazer.net
[86400] 85.142.237.104.in-addr.arpa. domain name pointer li839-85.members.linode.com
[86400] 86.142.237.104.in-addr.arpa. domain name pointer li839-86.members.linode.com
[86400] 87.142.237.104.in-addr.arpa. domain name pointer li839-87.members.linode.com
[86400] 88.142.237.104.in-addr.arpa. domain name pointer li839-88.members.linode.com
[86400] 89.142.237.104.in-addr.arpa. domain name pointer li839-89.members.linode.com
[86400] 90.142.237.104.in-addr.arpa. domain name pointer li839-90.members.linode.com
[86400] 91.142.237.104.in-addr.arpa. domain name pointer li839-91.members.linode.com
[86400] 92.142.237.104.in-addr.arpa. domain name pointer li839-92.members.linode.com
[86400] 93.142.237.104.in-addr.arpa. domain name pointer li839-93.members.linode.com
[86400] 94.142.237.104.in-addr.arpa. domain name pointer li839-94.members.linode.com
[86400] 95.142.237.104.in-addr.arpa. domain name pointer li839-95.members.linode.com
[86400] 96.142.237.104.in-addr.arpa. domain name pointer li839-96.members.linode.com
[86400] 97.142.237.104.in-addr.arpa. domain name pointer li839-97.members.linode.com
[86400] 98.142.237.104.in-addr.arpa. domain name pointer li839-98.members.linode.com
[86400] 99.142.237.104.in-addr.arpa. domain name pointer li839-99.members.linode.com
[86400] 100.142.237.104.in-addr.arpa. domain name pointer picasso.qisites.net
[86400] 101.142.237.104.in-addr.arpa. domain name pointer li839-101.members.linode.com
[86400] 102.142.237.104.in-addr.arpa. domain name pointer li839-102.members.linode.com
[86400] 103.142.237.104.in-addr.arpa. domain name pointer li839-103.members.linode.com
[86400] 104.142.237.104.in-addr.arpa. domain name pointer li839-104.members.linode.com
[86400] 105.142.237.104.in-addr.arpa. domain name pointer exchange17.centaurdelivery.com
[86400] 106.142.237.104.in-addr.arpa. domain name pointer li839-106.members.linode.com
[86400] 107.142.237.104.in-addr.arpa. domain name pointer li839-107.members.linode.com
[86400] 108.142.237.104.in-addr.arpa. domain name pointer li839-108.members.linode.com
[86400] 109.142.237.104.in-addr.arpa. domain name pointer li839-109.members.linode.com
[86400] 110.142.237.104.in-addr.arpa. domain name pointer li839-110.members.linode.com
[86400] 111.142.237.104.in-addr.arpa. domain name pointer mosstest2.com
[86400] 112.142.237.104.in-addr.arpa. domain name pointer li839-112.members.linode.com
[86400] 113.142.237.104.in-addr.arpa. domain name pointer li839-113.members.linode.com
[86400] 114.142.237.104.in-addr.arpa. domain name pointer li839-114.members.linode.com
[86400] 115.142.237.104.in-addr.arpa. domain name pointer li839-115.members.linode.com
[86400] 116.142.237.104.in-addr.arpa. domain name pointer li839-116.members.linode.com
[86400] 117.142.237.104.in-addr.arpa. domain name pointer li839-117.members.linode.com
[86400] 118.142.237.104.in-addr.arpa. domain name pointer li839-118.members.linode.com
[86400] 119.142.237.104.in-addr.arpa. domain name pointer li839-119.members.linode.com
[86400] 120.142.237.104.in-addr.arpa. domain name pointer li839-120.members.linode.com
[86400] 121.142.237.104.in-addr.arpa. domain name pointer srv02.us.savethevideo.com
[86400] 122.142.237.104.in-addr.arpa. domain name pointer dev.jodyzeitler.com
[86400] 123.142.237.104.in-addr.arpa. domain name pointer li839-123.members.linode.com
[86400] 124.142.237.104.in-addr.arpa. domain name pointer ip-104-237-142-124.configrapp.com
[86400] 125.142.237.104.in-addr.arpa. domain name pointer li839-125.members.linode.com
[86400] 126.142.237.104.in-addr.arpa. domain name pointer li839-126.members.linode.com
[86400] 127.142.237.104.in-addr.arpa. domain name pointer li839-127.members.linode.com
[86400] 128.142.237.104.in-addr.arpa. domain name pointer li839-128.members.linode.com
[86400] 129.142.237.104.in-addr.arpa. domain name pointer li839-129.members.linode.com
[86400] 130.142.237.104.in-addr.arpa. domain name pointer li839-130.members.linode.com
[86400] 131.142.237.104.in-addr.arpa. domain name pointer li839-131.members.linode.com
[86400] 132.142.237.104.in-addr.arpa. domain name pointer li839-132.members.linode.com
[86400] 133.142.237.104.in-addr.arpa. domain name pointer li839-133.members.linode.com
[86400] 134.142.237.104.in-addr.arpa. domain name pointer li839-134.members.linode.com
[86400] 135.142.237.104.in-addr.arpa. domain name pointer mx2.descartes.web-experto.com
[86400] 136.142.237.104.in-addr.arpa. domain name pointer li839-136.members.linode.com
[86400] 137.142.237.104.in-addr.arpa. domain name pointer li839-137.members.linode.com
[86400] 138.142.237.104.in-addr.arpa. domain name pointer li839-138.members.linode.com
[86400] 139.142.237.104.in-addr.arpa. domain name pointer li839-139.members.linode.com
[86400] 140.142.237.104.in-addr.arpa. domain name pointer li839-140.members.linode.com
[86400] 141.142.237.104.in-addr.arpa. domain name pointer thecantina.starwarsnewsnet.com
[86400] 142.142.237.104.in-addr.arpa. domain name pointer li839-142.members.linode.com
[86400] 143.142.237.104.in-addr.arpa. domain name pointer www.unbundledattorney.com
[86400] 144.142.237.104.in-addr.arpa. domain name pointer li839-144.members.linode.com
[86400] 145.142.237.104.in-addr.arpa. domain name pointer li839-145.members.linode.com
[86400] 146.142.237.104.in-addr.arpa. domain name pointer web1.chanrolapparel.com
[86400] 147.142.237.104.in-addr.arpa. domain name pointer li839-147.members.linode.com
[86400] 148.142.237.104.in-addr.arpa. domain name pointer min-extra-grab-71-ustx-prod.binaryedge.ninja
[86400] 149.142.237.104.in-addr.arpa. domain name pointer li839-149.members.linode.com
[86400] 150.142.237.104.in-addr.arpa. domain name pointer li839-150.members.linode.com
[86400] 151.142.237.104.in-addr.arpa. domain name pointer li839-151.members.linode.com
[86400] 152.142.237.104.in-addr.arpa. domain name pointer li839-152.members.linode.com
[86400] 153.142.237.104.in-addr.arpa. domain name pointer li839-153.members.linode.com
[86400] 154.142.237.104.in-addr.arpa. domain name pointer li839-154.members.linode.com
[86400] 155.142.237.104.in-addr.arpa. domain name pointer li839-155.members.linode.com
[86400] 156.142.237.104.in-addr.arpa. domain name pointer li839-156.members.linode.com
[86400] 157.142.237.104.in-addr.arpa. domain name pointer li839-157.members.linode.com
[86400] 158.142.237.104.in-addr.arpa. domain name pointer li839-158.members.linode.com
[86400] 159.142.237.104.in-addr.arpa. domain name pointer li839-159.members.linode.com
[86400] 160.142.237.104.in-addr.arpa. domain name pointer li839-160.members.linode.com
[86400] 161.142.237.104.in-addr.arpa. domain name pointer li839-161.members.linode.com
[86400] 162.142.237.104.in-addr.arpa. domain name pointer li839-162.members.linode.com
[86400] 163.142.237.104.in-addr.arpa. domain name pointer li839-163.members.linode.com
[86400] 164.142.237.104.in-addr.arpa. domain name pointer li839-164.members.linode.com
[86400] 165.142.237.104.in-addr.arpa. domain name pointer li839-165.members.linode.com
[86400] 166.142.237.104.in-addr.arpa. domain name pointer li839-166.members.linode.com
[86400] 167.142.237.104.in-addr.arpa. domain name pointer li839-167.members.linode.com
[86400] 168.142.237.104.in-addr.arpa. domain name pointer li839-168.members.linode.com
[86400] 169.142.237.104.in-addr.arpa. domain name pointer li839-169.members.linode.com
[86400] 170.142.237.104.in-addr.arpa. domain name pointer li839-170.members.linode.com
[86400] 171.142.237.104.in-addr.arpa. domain name pointer li839-171.members.linode.com
[86400] 172.142.237.104.in-addr.arpa. domain name pointer li839-172.members.linode.com
[86400] 173.142.237.104.in-addr.arpa. domain name pointer li839-173.members.linode.com
[86400] 174.142.237.104.in-addr.arpa. domain name pointer li839-174.members.linode.com
[86400] 175.142.237.104.in-addr.arpa. domain name pointer li839-175.members.linode.com
[86400] 176.142.237.104.in-addr.arpa. domain name pointer idp1.cirqlive.com
[86400] 177.142.237.104.in-addr.arpa. domain name pointer li839-177.members.linode.com
[86400] 178.142.237.104.in-addr.arpa. domain name pointer li839-178.members.linode.com
[86400] 179.142.237.104.in-addr.arpa. domain name pointer li839-179.members.linode.com
[86400] 180.142.237.104.in-addr.arpa. domain name pointer li839-180.members.linode.com
[86400] 181.142.237.104.in-addr.arpa. domain name pointer li839-181.members.linode.com
[86400] 182.142.237.104.in-addr.arpa. domain name pointer li839-182.members.linode.com
[86400] 183.142.237.104.in-addr.arpa. domain name pointer li839-183.members.linode.com
[86400] 184.142.237.104.in-addr.arpa. domain name pointer li839-184.members.linode.com
[86400] 185.142.237.104.in-addr.arpa. domain name pointer li839-185.members.linode.com
[86400] 186.142.237.104.in-addr.arpa. domain name pointer li839-186.members.linode.com
[86400] 187.142.237.104.in-addr.arpa. domain name pointer v01.panthar.org
[86400] 188.142.237.104.in-addr.arpa. domain name pointer li839-188.members.linode.com
[86400] 189.142.237.104.in-addr.arpa. domain name pointer li839-189.members.linode.com
[86400] 190.142.237.104.in-addr.arpa. domain name pointer tuconsultorio.com
[86400] 191.142.237.104.in-addr.arpa. domain name pointer li839-191.members.linode.com
[86400] 192.142.237.104.in-addr.arpa. domain name pointer li839-192.members.linode.com
[86400] 193.142.237.104.in-addr.arpa. domain name pointer mugo.ca
[86400] 194.142.237.104.in-addr.arpa. domain name pointer secure.massmentors.org
[86400] 195.142.237.104.in-addr.arpa. domain name pointer rhea.evimetry.com
[86400] 196.142.237.104.in-addr.arpa. domain name pointer tx3.fcomet.com
[86400] 197.142.237.104.in-addr.arpa. domain name pointer li839-197.members.linode.com
[86400] 198.142.237.104.in-addr.arpa. domain name pointer li839-198.members.linode.com
[86400] 199.142.237.104.in-addr.arpa. domain name pointer secure.catholicbigbrothers.org
[86400] 200.142.237.104.in-addr.arpa. domain name pointer li839-200.members.linode.com
[86400] 201.142.237.104.in-addr.arpa. domain name pointer general.aquenoadivinas.com
[86400] 202.142.237.104.in-addr.arpa. domain name pointer li839-202.members.linode.com
[86400] 203.142.237.104.in-addr.arpa. domain name pointer li839-203.members.linode.com
[86400] 204.142.237.104.in-addr.arpa. domain name pointer li839-204.members.linode.com
[86400] 205.142.237.104.in-addr.arpa. domain name pointer li839-205.members.linode.com
[86400] 206.142.237.104.in-addr.arpa. domain name pointer li839-206.members.linode.com
[86400] 207.142.237.104.in-addr.arpa. domain name pointer li839-207.members.linode.com
[86400] 208.142.237.104.in-addr.arpa. domain name pointer li839-208.members.linode.com
[86400] 209.142.237.104.in-addr.arpa. domain name pointer li839-209.members.linode.com
[86400] 210.142.237.104.in-addr.arpa. domain name pointer li839-210.members.linode.com
[86400] 211.142.237.104.in-addr.arpa. domain name pointer li839-211.members.linode.com
[86400] 212.142.237.104.in-addr.arpa. domain name pointer li839-212.members.linode.com
[86400] 213.142.237.104.in-addr.arpa. domain name pointer li839-213.members.linode.com
[86400] 214.142.237.104.in-addr.arpa. domain name pointer li839-214.members.linode.com
[86400] 215.142.237.104.in-addr.arpa. domain name pointer li839-215.members.linode.com
[86400] 216.142.237.104.in-addr.arpa. domain name pointer li839-216.members.linode.com
[86400] 217.142.237.104.in-addr.arpa. domain name pointer li839-217.members.linode.com
[86400] 218.142.237.104.in-addr.arpa. domain name pointer li839-218.members.linode.com
[86400] 219.142.237.104.in-addr.arpa. domain name pointer li839-219.members.linode.com
[86400] 220.142.237.104.in-addr.arpa. domain name pointer li839-220.members.linode.com
[86400] 221.142.237.104.in-addr.arpa. domain name pointer bert.scottdial.com
[86400] 222.142.237.104.in-addr.arpa. domain name pointer li839-222.members.linode.com
[86400] 223.142.237.104.in-addr.arpa. domain name pointer li839-223.members.linode.com
[86400] 224.142.237.104.in-addr.arpa. domain name pointer li839-224.members.linode.com
[86400] 225.142.237.104.in-addr.arpa. domain name pointer li839-225.members.linode.com
[86400] 226.142.237.104.in-addr.arpa. domain name pointer li839-226.members.linode.com
[86400] 227.142.237.104.in-addr.arpa. domain name pointer li839-227.members.linode.com
[86400] 228.142.237.104.in-addr.arpa. domain name pointer li839-228.members.linode.com
[86400] 229.142.237.104.in-addr.arpa. domain name pointer li839-229.members.linode.com
[86400] 230.142.237.104.in-addr.arpa. domain name pointer li839-230.members.linode.com
[86400] 231.142.237.104.in-addr.arpa. domain name pointer li839-231.members.linode.com
[86400] 232.142.237.104.in-addr.arpa. domain name pointer li839-232.members.linode.com
[86400] 233.142.237.104.in-addr.arpa. domain name pointer wf-104-237-142-233.webfaction.com
[86400] 234.142.237.104.in-addr.arpa. domain name pointer li839-234.members.linode.com
[86400] 235.142.237.104.in-addr.arpa. domain name pointer li839-235.members.linode.com
[86400] 236.142.237.104.in-addr.arpa. domain name pointer li839-236.members.linode.com
[86400] 237.142.237.104.in-addr.arpa. domain name pointer li839-237.members.linode.com
[86400] 238.142.237.104.in-addr.arpa. domain name pointer li839-238.members.linode.com
[86400] 239.142.237.104.in-addr.arpa. domain name pointer li839-239.members.linode.com
[86400] 240.142.237.104.in-addr.arpa. domain name pointer li839-240.members.linode.com
[86400] 241.142.237.104.in-addr.arpa. domain name pointer li839-241.members.linode.com
[86400] 242.142.237.104.in-addr.arpa. domain name pointer li839-242.members.linode.com
[86400] 243.142.237.104.in-addr.arpa. domain name pointer li839-243.members.linode.com
[86400] 244.142.237.104.in-addr.arpa. domain name pointer li839-244.members.linode.com
[86400] 245.142.237.104.in-addr.arpa. domain name pointer li839-245.members.linode.com
[86400] 246.142.237.104.in-addr.arpa. domain name pointer li839-246.members.linode.com
[86400] 247.142.237.104.in-addr.arpa. domain name pointer li839-247.members.linode.com
[86400] 248.142.237.104.in-addr.arpa. domain name pointer li839-248.members.linode.com
[86400] 249.142.237.104.in-addr.arpa. domain name pointer li839-249.members.linode.com
[86400] 250.142.237.104.in-addr.arpa. domain name pointer li839-250.members.linode.com
[86400] 251.142.237.104.in-addr.arpa. domain name pointer li839-251.members.linode.com
[86400] 252.142.237.104.in-addr.arpa. domain name pointer li839-252.members.linode.com
[86400] 253.142.237.104.in-addr.arpa. domain name pointer li839-253.members.linode.com
[86400] 254.142.237.104.in-addr.arpa. domain name pointer plataformatec.com.br
[0] 255.142.237.104.in-addr.arpa.: domain name does not exist