[0] 0.68.114.66.in-addr.arpa.: domain name does not exist
[86400] 1.68.114.66.in-addr.arpa. domain name pointer gw-n68.aceinnovative.com
[86400] 2.68.114.66.in-addr.arpa. domain name pointer p68-2.acedsl.com
[86400] 3.68.114.66.in-addr.arpa. domain name pointer p68-3.acedsl.com
[86400] 4.68.114.66.in-addr.arpa. domain name pointer p68-4.acedsl.com
[86400] 5.68.114.66.in-addr.arpa. domain name pointer p68-5.acedsl.com
[86400] 6.68.114.66.in-addr.arpa. domain name pointer p68-6.acedsl.com
[86400] 7.68.114.66.in-addr.arpa. domain name pointer p68-7.acedsl.com
[86400] 8.68.114.66.in-addr.arpa. domain name pointer p68-8.acedsl.com
[86400] 9.68.114.66.in-addr.arpa. domain name pointer p68-9.acedsl.com
[86400] 10.68.114.66.in-addr.arpa. domain name pointer p68-10.acedsl.com
[86400] 11.68.114.66.in-addr.arpa. domain name pointer p68-11.acedsl.com
[86400] 12.68.114.66.in-addr.arpa. domain name pointer p68-12.acedsl.com
[86400] 13.68.114.66.in-addr.arpa. domain name pointer p68-13.acedsl.com
[86400] 14.68.114.66.in-addr.arpa. domain name pointer p68-14.acedsl.com
[86400] 15.68.114.66.in-addr.arpa. domain name pointer p68-15.acedsl.com
[86400] 16.68.114.66.in-addr.arpa. domain name pointer cncassociates.com
[86400] 17.68.114.66.in-addr.arpa. domain name pointer p68-17.acedsl.com
[86400] 18.68.114.66.in-addr.arpa. domain name pointer p68-18.acedsl.com
[86400] 19.68.114.66.in-addr.arpa. domain name pointer p68-19.acedsl.com
[86400] 20.68.114.66.in-addr.arpa. domain name pointer p68-20.acedsl.com
[86400] 21.68.114.66.in-addr.arpa. domain name pointer mail.peteradvani.com
[86400] 22.68.114.66.in-addr.arpa. domain name pointer mail.benmetrick.com
[86400] 23.68.114.66.in-addr.arpa. domain name pointer p68-23.acedsl.com
[86400] 24.68.114.66.in-addr.arpa. domain name pointer allworth.com
[86400] 25.68.114.66.in-addr.arpa. domain name pointer p68-25.acedsl.com
[86400] 26.68.114.66.in-addr.arpa. domain name pointer p68-26.acedsl.com
[86400] 27.68.114.66.in-addr.arpa. domain name pointer p68-27.acedsl.com
[86400] 28.68.114.66.in-addr.arpa. domain name pointer mail.natcellular.com
[86400] 29.68.114.66.in-addr.arpa. domain name pointer mail.abffe.com
[86400] 30.68.114.66.in-addr.arpa. domain name pointer p68-30.acedsl.com
[86400] 31.68.114.66.in-addr.arpa. domain name pointer p68-31.acedsl.com
[86400] 32.68.114.66.in-addr.arpa. domain name pointer p68-32.acedsl.com
[86400] 33.68.114.66.in-addr.arpa. domain name pointer p68-33.acedsl.com
[86400] 34.68.114.66.in-addr.arpa. domain name pointer p68-34.acedsl.com
[86400] 35.68.114.66.in-addr.arpa. domain name pointer p68-35.acedsl.com
[86400] 36.68.114.66.in-addr.arpa. domain name pointer jae.dsl.acedsl.com
[86400] 37.68.114.66.in-addr.arpa. domain name pointer mail.barerliterary.com
[86400] 38.68.114.66.in-addr.arpa. domain name pointer p68-38.acedsl.com
[86400] 39.68.114.66.in-addr.arpa. domain name pointer p68-39.acedsl.com
[86400] 40.68.114.66.in-addr.arpa. domain name pointer p68-40.acedsl.com
[86400] 41.68.114.66.in-addr.arpa. domain name pointer p68-41.acedsl.com
[86400] 42.68.114.66.in-addr.arpa. domain name pointer p68-42.acedsl.com
[86400] 43.68.114.66.in-addr.arpa. domain name pointer p68-43.acedsl.com
[86400] 44.68.114.66.in-addr.arpa. domain name pointer p68-44.acedsl.com
[86400] 45.68.114.66.in-addr.arpa. domain name pointer p68-45.acedsl.com
[86400] 46.68.114.66.in-addr.arpa. domain name pointer p68-46.acedsl.com
[86400] 47.68.114.66.in-addr.arpa. domain name pointer p68-47.acedsl.com
[86400] 48.68.114.66.in-addr.arpa. domain name pointer p68-48.acedsl.com
[86400] 49.68.114.66.in-addr.arpa. domain name pointer p68-49.acedsl.com
[86400] 50.68.114.66.in-addr.arpa. domain name pointer p68-50.acedsl.com
[86400] 51.68.114.66.in-addr.arpa. domain name pointer love.jsacomputers.com
[86400] 52.68.114.66.in-addr.arpa. domain name pointer p68-52.acedsl.com
[86400] 53.68.114.66.in-addr.arpa. domain name pointer p68-53.acedsl.com
[86400] 54.68.114.66.in-addr.arpa. domain name pointer p68-54.acedsl.com
[86400] 55.68.114.66.in-addr.arpa. domain name pointer p68-55.acedsl.com
[86400] 56.68.114.66.in-addr.arpa. domain name pointer p68-56.acedsl.com
[86400] 57.68.114.66.in-addr.arpa. domain name pointer p68-57.acedsl.com
[86400] 58.68.114.66.in-addr.arpa. domain name pointer p68-58.acedsl.com
[86400] 59.68.114.66.in-addr.arpa. domain name pointer p68-59.acedsl.com
[86400] 60.68.114.66.in-addr.arpa. domain name pointer p68-60.acedsl.com
[86400] 61.68.114.66.in-addr.arpa. domain name pointer p68-61.acedsl.com
[86400] 62.68.114.66.in-addr.arpa. domain name pointer p68-62.acedsl.com
[86400] 63.68.114.66.in-addr.arpa. domain name pointer p68-63.acedsl.com
[86400] 64.68.114.66.in-addr.arpa. domain name pointer p68-64.acedsl.com
[86400] 65.68.114.66.in-addr.arpa. domain name pointer p68-65.acedsl.com
[86400] 66.68.114.66.in-addr.arpa. domain name pointer p68-66.acedsl.com
[86400] 67.68.114.66.in-addr.arpa. domain name pointer p68-67.acedsl.com
[86400] 68.68.114.66.in-addr.arpa. domain name pointer p68-68.acedsl.com
[86400] 69.68.114.66.in-addr.arpa. domain name pointer p68-69.acedsl.com
[86400] 70.68.114.66.in-addr.arpa. domain name pointer p68-70.acedsl.com
[86400] 71.68.114.66.in-addr.arpa. domain name pointer p68-71.acedsl.com
[86400] 72.68.114.66.in-addr.arpa. domain name pointer p68-72.acedsl.com
[86400] 73.68.114.66.in-addr.arpa. domain name pointer p68-73.acedsl.com
[86400] 74.68.114.66.in-addr.arpa. domain name pointer p68-74.acedsl.com
[86400] 75.68.114.66.in-addr.arpa. domain name pointer mail.parkliterary.com
[86400] 76.68.114.66.in-addr.arpa. domain name pointer p68-76.acedsl.com
[86400] 77.68.114.66.in-addr.arpa. domain name pointer p68-77.acedsl.com
[86400] 78.68.114.66.in-addr.arpa. domain name pointer p68-78.acedsl.com
[86400] 79.68.114.66.in-addr.arpa. domain name pointer p68-79.acedsl.com
[86400] 80.68.114.66.in-addr.arpa. domain name pointer mail.bbcpas.com
[86400] 81.68.114.66.in-addr.arpa. domain name pointer p68-81.acedsl.com
[86400] 82.68.114.66.in-addr.arpa. domain name pointer p68-82.acedsl.com
[86400] 83.68.114.66.in-addr.arpa. domain name pointer p68-83.acedsl.com
[86400] 84.68.114.66.in-addr.arpa. domain name pointer p68-84.acedsl.com
[86400] 85.68.114.66.in-addr.arpa. domain name pointer p68-85.acedsl.com
[86400] 86.68.114.66.in-addr.arpa. domain name pointer p68-86.acedsl.com
[86400] 87.68.114.66.in-addr.arpa. domain name pointer p68-87.acedsl.com
[86400] 88.68.114.66.in-addr.arpa. domain name pointer p68-88.acedsl.com
[86400] 89.68.114.66.in-addr.arpa. domain name pointer p68-89.acedsl.com
[86400] 90.68.114.66.in-addr.arpa. domain name pointer p68-90.acedsl.com
[86400] 91.68.114.66.in-addr.arpa. domain name pointer ftp.bldikman.com p68-91.acedsl.com www.bldikman.com
[86400] 92.68.114.66.in-addr.arpa. domain name pointer p68-92.acedsl.com
[86400] 93.68.114.66.in-addr.arpa. domain name pointer p68-93.acedsl.com
[86400] 94.68.114.66.in-addr.arpa. domain name pointer p68-94.acedsl.com
[86400] 95.68.114.66.in-addr.arpa. domain name pointer p68-95.acedsl.com
[86400] 96.68.114.66.in-addr.arpa. domain name pointer p68-96.acedsl.com
[86400] 97.68.114.66.in-addr.arpa. domain name pointer p68-97.acedsl.com
[86400] 98.68.114.66.in-addr.arpa. domain name pointer p68-98.acedsl.com
[86400] 99.68.114.66.in-addr.arpa. domain name pointer p68-99.acedsl.com
[86400] 100.68.114.66.in-addr.arpa. domain name pointer p68-100.acedsl.com
[86400] 101.68.114.66.in-addr.arpa. domain name pointer p68-101.acedsl.com
[86400] 102.68.114.66.in-addr.arpa. domain name pointer p68-102.acedsl.com
[86400] 103.68.114.66.in-addr.arpa. domain name pointer p68-103.acedsl.com
[86400] 104.68.114.66.in-addr.arpa. domain name pointer p68-104.acedsl.com
[86400] 105.68.114.66.in-addr.arpa. domain name pointer p68-105.acedsl.com
[86400] 106.68.114.66.in-addr.arpa. domain name pointer p68-106.acedsl.com
[86400] 107.68.114.66.in-addr.arpa. domain name pointer p68-107.acedsl.com
[86400] 108.68.114.66.in-addr.arpa. domain name pointer p68-108.acedsl.com
[86400] 109.68.114.66.in-addr.arpa. domain name pointer p68-109.acedsl.com
[86400] 110.68.114.66.in-addr.arpa. domain name pointer p68-110.acedsl.com
[86400] 111.68.114.66.in-addr.arpa. domain name pointer p68-111.acedsl.com
[86400] 112.68.114.66.in-addr.arpa. domain name pointer p68-112.acedsl.com
[86400] 113.68.114.66.in-addr.arpa. domain name pointer p68-113.acedsl.com
[86400] 114.68.114.66.in-addr.arpa. domain name pointer p68-114.acedsl.com
[86400] 115.68.114.66.in-addr.arpa. domain name pointer p68-115.acedsl.com
[86400] 116.68.114.66.in-addr.arpa. domain name pointer p68-116.acedsl.com
[86400] 117.68.114.66.in-addr.arpa. domain name pointer p68-117.acedsl.com
[86400] 118.68.114.66.in-addr.arpa. domain name pointer p68-118.acedsl.com
[86400] 119.68.114.66.in-addr.arpa. domain name pointer p68-119.acedsl.com
[86400] 120.68.114.66.in-addr.arpa. domain name pointer p68-120.acedsl.com
[86400] 121.68.114.66.in-addr.arpa. domain name pointer p68-121.acedsl.com
[86400] 122.68.114.66.in-addr.arpa. domain name pointer p68-122.acedsl.com
[86400] 123.68.114.66.in-addr.arpa. domain name pointer p68-123.acedsl.com
[86400] 124.68.114.66.in-addr.arpa. domain name pointer p68-124.acedsl.com
[86400] 125.68.114.66.in-addr.arpa. domain name pointer www.igotten.com www.geegeeworld.com p68-125.acedsl.com
[86400] 126.68.114.66.in-addr.arpa. domain name pointer mail02.iggoten.com p68-126.acedsl.com
[86400] 127.68.114.66.in-addr.arpa. domain name pointer p68-127.acedsl.com
[86400] 128.68.114.66.in-addr.arpa. domain name pointer p68-128.acedsl.com
[86400] 129.68.114.66.in-addr.arpa. domain name pointer p68-129.acedsl.com
[86400] 130.68.114.66.in-addr.arpa. domain name pointer p68-130.acedsl.com
[86400] 131.68.114.66.in-addr.arpa. domain name pointer p68-131.acedsl.com
[86400] 132.68.114.66.in-addr.arpa. domain name pointer p68-132.acedsl.com
[86400] 133.68.114.66.in-addr.arpa. domain name pointer p68-133.acedsl.com
[86400] 134.68.114.66.in-addr.arpa. domain name pointer p68-134.acedsl.com
[86400] 135.68.114.66.in-addr.arpa. domain name pointer p68-135.acedsl.com
[86400] 136.68.114.66.in-addr.arpa. domain name pointer p68-136.acedsl.com
[86400] 137.68.114.66.in-addr.arpa. domain name pointer p68-137.acedsl.com
[86400] 138.68.114.66.in-addr.arpa. domain name pointer p68-138.acedsl.com
[86400] 139.68.114.66.in-addr.arpa. domain name pointer p68-139.acedsl.com
[86400] 140.68.114.66.in-addr.arpa. domain name pointer p68-140.acedsl.com
[86400] 141.68.114.66.in-addr.arpa. domain name pointer p68-141.acedsl.com
[86400] 142.68.114.66.in-addr.arpa. domain name pointer p68-142.acedsl.com
[86400] 143.68.114.66.in-addr.arpa. domain name pointer p68-143.acedsl.com
[86400] 144.68.114.66.in-addr.arpa. domain name pointer p68-144.acedsl.com
[86400] 145.68.114.66.in-addr.arpa. domain name pointer p68-145.acedsl.com
[86400] 146.68.114.66.in-addr.arpa. domain name pointer p68-146.acedsl.com
[86400] 147.68.114.66.in-addr.arpa. domain name pointer p68-147.acedsl.com
[86400] 148.68.114.66.in-addr.arpa. domain name pointer p68-148.acedsl.com
[86400] 149.68.114.66.in-addr.arpa. domain name pointer p68-149.acedsl.com
[86400] 150.68.114.66.in-addr.arpa. domain name pointer interceptor.mindcrash.com
[86400] 151.68.114.66.in-addr.arpa. domain name pointer p68-151.acedsl.com
[86400] 152.68.114.66.in-addr.arpa. domain name pointer p68-152.acedsl.com
[86400] 153.68.114.66.in-addr.arpa. domain name pointer p68-153.acedsl.com
[86400] 154.68.114.66.in-addr.arpa. domain name pointer p68-154.acedsl.com
[86400] 155.68.114.66.in-addr.arpa. domain name pointer p68-155.acedsl.com
[86400] 156.68.114.66.in-addr.arpa. domain name pointer p68-156.acedsl.com
[86400] 157.68.114.66.in-addr.arpa. domain name pointer p68-157.acedsl.com
[86400] 158.68.114.66.in-addr.arpa. domain name pointer p68-158.acedsl.com
[86400] 159.68.114.66.in-addr.arpa. domain name pointer p68-159.acedsl.com
[86400] 160.68.114.66.in-addr.arpa. domain name pointer p68-160.acedsl.com
[86400] 161.68.114.66.in-addr.arpa. domain name pointer nycirc.com
[86400] 162.68.114.66.in-addr.arpa. domain name pointer p68-162.acedsl.com
[86400] 163.68.114.66.in-addr.arpa. domain name pointer p68-163.acedsl.com
[86400] 164.68.114.66.in-addr.arpa. domain name pointer p68-164.acedsl.com
[86400] 165.68.114.66.in-addr.arpa. domain name pointer p68-165.acedsl.com
[86400] 166.68.114.66.in-addr.arpa. domain name pointer p68-166.acedsl.com
[86400] 167.68.114.66.in-addr.arpa. domain name pointer p68-167.acedsl.com
[86400] 168.68.114.66.in-addr.arpa. domain name pointer p68-168.acedsl.com
[86400] 169.68.114.66.in-addr.arpa. domain name pointer p68-169.acedsl.com
[86400] 170.68.114.66.in-addr.arpa. domain name pointer p68-170.acedsl.com
[86400] 171.68.114.66.in-addr.arpa. domain name pointer p68-171.acedsl.com
[86400] 172.68.114.66.in-addr.arpa. domain name pointer total.confusion.net
[86400] 173.68.114.66.in-addr.arpa. domain name pointer p68-173.acedsl.com
[86400] 174.68.114.66.in-addr.arpa. domain name pointer p68-174.acedsl.com
[86400] 175.68.114.66.in-addr.arpa. domain name pointer p68-175.acedsl.com
[86400] 176.68.114.66.in-addr.arpa. domain name pointer p68-176.acedsl.com
[86400] 177.68.114.66.in-addr.arpa. domain name pointer p68-177.acedsl.com
[86400] 178.68.114.66.in-addr.arpa. domain name pointer p68-178.acedsl.com
[86400] 179.68.114.66.in-addr.arpa. domain name pointer p68-179.acedsl.com
[86400] 180.68.114.66.in-addr.arpa. domain name pointer p68-180.acedsl.com
[86400] 181.68.114.66.in-addr.arpa. domain name pointer p68-181.acedsl.com
[86400] 182.68.114.66.in-addr.arpa. domain name pointer p68-182.acedsl.com
[86400] 183.68.114.66.in-addr.arpa. domain name pointer p68-183.acedsl.com
[86400] 184.68.114.66.in-addr.arpa. domain name pointer p68-184.acedsl.com
[86400] 185.68.114.66.in-addr.arpa. domain name pointer p68-185.acedsl.com
[86400] 186.68.114.66.in-addr.arpa. domain name pointer p68-186.acedsl.com
[86400] 187.68.114.66.in-addr.arpa. domain name pointer p68-187.acedsl.com
[86400] 188.68.114.66.in-addr.arpa. domain name pointer p68-188.acedsl.com
[86400] 189.68.114.66.in-addr.arpa. domain name pointer p68-189.acedsl.com
[86400] 190.68.114.66.in-addr.arpa. domain name pointer p68-190.acedsl.com
[86400] 191.68.114.66.in-addr.arpa. domain name pointer p68-191.acedsl.com
[86400] 192.68.114.66.in-addr.arpa. domain name pointer p68-192.acedsl.com
[86400] 193.68.114.66.in-addr.arpa. domain name pointer p68-193.acedsl.com
[86400] 194.68.114.66.in-addr.arpa. domain name pointer p68-194.acedsl.com
[86400] 195.68.114.66.in-addr.arpa. domain name pointer p68-195.acedsl.com
[86400] 196.68.114.66.in-addr.arpa. domain name pointer p68-196.acedsl.com
[86400] 197.68.114.66.in-addr.arpa. domain name pointer p68-197.acedsl.com
[86400] 198.68.114.66.in-addr.arpa. domain name pointer p68-198.acedsl.com
[86400] 199.68.114.66.in-addr.arpa. domain name pointer p68-199.acedsl.com
[86400] 200.68.114.66.in-addr.arpa. domain name pointer p68-200.acedsl.com
[86400] 201.68.114.66.in-addr.arpa. domain name pointer p68-201.acedsl.com
[86400] 202.68.114.66.in-addr.arpa. domain name pointer p68-202.acedsl.com
[86400] 203.68.114.66.in-addr.arpa. domain name pointer p68-203.acedsl.com
[86400] 204.68.114.66.in-addr.arpa. domain name pointer p68-204.acedsl.com
[86400] 205.68.114.66.in-addr.arpa. domain name pointer p68-205.acedsl.com
[86400] 206.68.114.66.in-addr.arpa. domain name pointer p68-206.acedsl.com
[86400] 207.68.114.66.in-addr.arpa. domain name pointer p68-207.acedsl.com
[86400] 208.68.114.66.in-addr.arpa. domain name pointer p68-208.acedsl.com
[86400] 209.68.114.66.in-addr.arpa. domain name pointer p68-209.acedsl.com
[86400] 210.68.114.66.in-addr.arpa. domain name pointer p68-210.acedsl.com
[86400] 211.68.114.66.in-addr.arpa. domain name pointer p68-211.acedsl.com
[86400] 212.68.114.66.in-addr.arpa. domain name pointer p68-212.acedsl.com
[86400] 213.68.114.66.in-addr.arpa. domain name pointer p68-213.acedsl.com
[86400] 214.68.114.66.in-addr.arpa. domain name pointer p68-214.acedsl.com
[86400] 215.68.114.66.in-addr.arpa. domain name pointer p68-215.acedsl.com
[86400] 216.68.114.66.in-addr.arpa. domain name pointer p68-216.acedsl.com
[86400] 217.68.114.66.in-addr.arpa. domain name pointer p68-217.acedsl.com
[86400] 218.68.114.66.in-addr.arpa. domain name pointer p68-218.acedsl.com
[86400] 219.68.114.66.in-addr.arpa. domain name pointer p68-219.acedsl.com
[86400] 220.68.114.66.in-addr.arpa. domain name pointer p68-220.acedsl.com
[86400] 221.68.114.66.in-addr.arpa. domain name pointer p68-221.acedsl.com
[86400] 222.68.114.66.in-addr.arpa. domain name pointer p68-222.acedsl.com
[86400] 223.68.114.66.in-addr.arpa. domain name pointer p68-223.acedsl.com
[86400] 224.68.114.66.in-addr.arpa. domain name pointer p68-224.acedsl.com
[86400] 225.68.114.66.in-addr.arpa. domain name pointer p68-225.acedsl.com
[86400] 226.68.114.66.in-addr.arpa. domain name pointer p68-226.acedsl.com
[86400] 227.68.114.66.in-addr.arpa. domain name pointer p68-227.acedsl.com
[86400] 228.68.114.66.in-addr.arpa. domain name pointer p68-228.acedsl.com
[86400] 229.68.114.66.in-addr.arpa. domain name pointer p68-229.acedsl.com
[86400] 230.68.114.66.in-addr.arpa. domain name pointer p68-230.acedsl.com
[86400] 231.68.114.66.in-addr.arpa. domain name pointer p68-231.acedsl.com
[86400] 232.68.114.66.in-addr.arpa. domain name pointer p68-232.acedsl.com
[86400] 233.68.114.66.in-addr.arpa. domain name pointer p68-233.acedsl.com
[86400] 234.68.114.66.in-addr.arpa. domain name pointer p68-234.acedsl.com
[86400] 235.68.114.66.in-addr.arpa. domain name pointer p68-235.acedsl.com
[86400] 236.68.114.66.in-addr.arpa. domain name pointer p68-236.acedsl.com
[86400] 237.68.114.66.in-addr.arpa. domain name pointer remote.bbnrlaw.com
[86400] 238.68.114.66.in-addr.arpa. domain name pointer p68-238.acedsl.com
[86400] 239.68.114.66.in-addr.arpa. domain name pointer p68-239.acedsl.com
[86400] 240.68.114.66.in-addr.arpa. domain name pointer p68-240.acedsl.com
[86400] 241.68.114.66.in-addr.arpa. domain name pointer p68-241.acedsl.com
[86400] 242.68.114.66.in-addr.arpa. domain name pointer p68-242.acedsl.com
[86400] 243.68.114.66.in-addr.arpa. domain name pointer p68-243.acedsl.com
[86400] 244.68.114.66.in-addr.arpa. domain name pointer p68-244.acedsl.com
[86400] 245.68.114.66.in-addr.arpa. domain name pointer p68-245.acedsl.com
[86400] 246.68.114.66.in-addr.arpa. domain name pointer p68-246.acedsl.com
[86400] 247.68.114.66.in-addr.arpa. domain name pointer p68-247.acedsl.com
[86400] 248.68.114.66.in-addr.arpa. domain name pointer p68-248.acedsl.com
[86400] 249.68.114.66.in-addr.arpa. domain name pointer p68-249.acedsl.com
[86400] 250.68.114.66.in-addr.arpa. domain name pointer p68-250.acedsl.com
[86400] 251.68.114.66.in-addr.arpa. domain name pointer p68-251.acedsl.com
[86400] 252.68.114.66.in-addr.arpa. domain name pointer p68-252.acedsl.com
[86400] 253.68.114.66.in-addr.arpa. domain name pointer p68-253.acedsl.com
[86400] 254.68.114.66.in-addr.arpa. domain name pointer p68-254.acedsl.com
[0] 255.68.114.66.in-addr.arpa.: domain name does not exist