[0] 0.190.19.217.in-addr.arpa.: domain name does not exist [86400] 1.190.19.217.in-addr.arpa. domain name pointer 190-1.access.witcom.de [86400] 2.190.19.217.in-addr.arpa. domain name pointer 190-2.access.witcom.de [86400] 3.190.19.217.in-addr.arpa. domain name pointer 190-3.access.witcom.de [86400] 4.190.19.217.in-addr.arpa. domain name pointer 190-4.access.witcom.de [86400] 5.190.19.217.in-addr.arpa. domain name pointer 190-5.access.witcom.de [86400] 6.190.19.217.in-addr.arpa. domain name pointer 190-6.access.witcom.de [86400] 7.190.19.217.in-addr.arpa. domain name pointer 190-7.access.witcom.de [86400] 8.190.19.217.in-addr.arpa. domain name pointer 190-8.access.witcom.de [86400] 9.190.19.217.in-addr.arpa. domain name pointer 190-9.access.witcom.de [86400] 10.190.19.217.in-addr.arpa. domain name pointer 190-10.access.witcom.de [86400] 11.190.19.217.in-addr.arpa. domain name pointer 190-11.access.witcom.de [86400] 12.190.19.217.in-addr.arpa. domain name pointer 190-12.access.witcom.de [86400] 13.190.19.217.in-addr.arpa. domain name pointer 190-13.access.witcom.de [86400] 14.190.19.217.in-addr.arpa. domain name pointer 190-14.access.witcom.de [86400] 15.190.19.217.in-addr.arpa. domain name pointer 190-15.access.witcom.de [86400] 16.190.19.217.in-addr.arpa. domain name pointer 190-16.access.witcom.de [86400] 17.190.19.217.in-addr.arpa. domain name pointer 190-17.access.witcom.de [86400] 18.190.19.217.in-addr.arpa. domain name pointer 190-18.access.witcom.de [86400] 19.190.19.217.in-addr.arpa. domain name pointer 190-19.access.witcom.de [86400] 20.190.19.217.in-addr.arpa. domain name pointer 190-20.access.witcom.de [86400] 21.190.19.217.in-addr.arpa. domain name pointer dmz.rhein-main-hallen.de [86400] 22.190.19.217.in-addr.arpa. domain name pointer voip.rhein-main-hallen.de [86400] 23.190.19.217.in-addr.arpa. domain name pointer 190-23.access.witcom.de [86400] 24.190.19.217.in-addr.arpa. domain name pointer 190-24.access.witcom.de [86400] 25.190.19.217.in-addr.arpa. domain name pointer 190-25.access.witcom.de [86400] 26.190.19.217.in-addr.arpa. domain name pointer 190-26.access.witcom.de [86400] 27.190.19.217.in-addr.arpa. domain name pointer 190-27.access.witcom.de [86400] 28.190.19.217.in-addr.arpa. domain name pointer 190-28.access.witcom.de [86400] 29.190.19.217.in-addr.arpa. domain name pointer 190-29.access.witcom.de [86400] 30.190.19.217.in-addr.arpa. domain name pointer 190-30.access.witcom.de [86400] 31.190.19.217.in-addr.arpa. domain name pointer 190-31.access.witcom.de [86400] 32.190.19.217.in-addr.arpa. domain name pointer 190-32.access.witcom.de [86400] 33.190.19.217.in-addr.arpa. domain name pointer 190-33.access.witcom.de [86400] 34.190.19.217.in-addr.arpa. domain name pointer 190-34.access.witcom.de [86400] 35.190.19.217.in-addr.arpa. domain name pointer 190-35.access.witcom.de [86400] 36.190.19.217.in-addr.arpa. domain name pointer 190-36.access.witcom.de [86400] 37.190.19.217.in-addr.arpa. domain name pointer 190-37.access.witcom.de [86400] 38.190.19.217.in-addr.arpa. domain name pointer 190-38.access.witcom.de [86400] 39.190.19.217.in-addr.arpa. domain name pointer 190-39.access.witcom.de [86400] 40.190.19.217.in-addr.arpa. domain name pointer 190-40.access.witcom.de [86400] 41.190.19.217.in-addr.arpa. domain name pointer 190-41.access.witcom.de [86400] 42.190.19.217.in-addr.arpa. domain name pointer 190-42.access.witcom.de [86400] 43.190.19.217.in-addr.arpa. domain name pointer 190-43.access.witcom.de [86400] 44.190.19.217.in-addr.arpa. domain name pointer 190-44.access.witcom.de [86400] 45.190.19.217.in-addr.arpa. domain name pointer 190-45.access.witcom.de [86400] 46.190.19.217.in-addr.arpa. domain name pointer 190-46.access.witcom.de [86400] 47.190.19.217.in-addr.arpa. domain name pointer 190-47.access.witcom.de [86400] 48.190.19.217.in-addr.arpa. domain name pointer 190-48.access.witcom.de [86400] 49.190.19.217.in-addr.arpa. domain name pointer 190-49.access.witcom.de [86400] 50.190.19.217.in-addr.arpa. domain name pointer 190-50.access.witcom.de [86400] 51.190.19.217.in-addr.arpa. domain name pointer 190-51.access.witcom.de [86400] 52.190.19.217.in-addr.arpa. domain name pointer 190-52.access.witcom.de [86400] 53.190.19.217.in-addr.arpa. domain name pointer 190-53.access.witcom.de [86400] 54.190.19.217.in-addr.arpa. domain name pointer 190-54.access.witcom.de [86400] 55.190.19.217.in-addr.arpa. domain name pointer 190-55.access.witcom.de [86400] 56.190.19.217.in-addr.arpa. domain name pointer 190-56.access.witcom.de [86400] 57.190.19.217.in-addr.arpa. domain name pointer 190-57.access.witcom.de [86400] 58.190.19.217.in-addr.arpa. domain name pointer 190-58.access.witcom.de [86400] 59.190.19.217.in-addr.arpa. domain name pointer 190-59.access.witcom.de [86400] 60.190.19.217.in-addr.arpa. domain name pointer 190-60.access.witcom.de [86400] 61.190.19.217.in-addr.arpa. domain name pointer 190-61.access.witcom.de [86400] 62.190.19.217.in-addr.arpa. domain name pointer 190-62.access.witcom.de [86400] 63.190.19.217.in-addr.arpa. domain name pointer 190-63.access.witcom.de [86400] 64.190.19.217.in-addr.arpa. domain name pointer 190-64.access.witcom.de [86400] 65.190.19.217.in-addr.arpa. domain name pointer 190-65.access.witcom.de [86400] 66.190.19.217.in-addr.arpa. domain name pointer 190-66.access.witcom.de [86400] 67.190.19.217.in-addr.arpa. domain name pointer 190-67.access.witcom.de [86400] 68.190.19.217.in-addr.arpa. domain name pointer 190-68.access.witcom.de [86400] 69.190.19.217.in-addr.arpa. domain name pointer 190-69.access.witcom.de [86400] 70.190.19.217.in-addr.arpa. domain name pointer 190-70.access.witcom.de [86400] 71.190.19.217.in-addr.arpa. domain name pointer 190-71.access.witcom.de [86400] 72.190.19.217.in-addr.arpa. domain name pointer 190-72.access.witcom.de [86400] 73.190.19.217.in-addr.arpa. domain name pointer 190-73.access.witcom.de [86400] 74.190.19.217.in-addr.arpa. domain name pointer 190-74.access.witcom.de [86400] 75.190.19.217.in-addr.arpa. domain name pointer 190-75.access.witcom.de [86400] 76.190.19.217.in-addr.arpa. domain name pointer 190-76.access.witcom.de [86400] 77.190.19.217.in-addr.arpa. domain name pointer 190-77.access.witcom.de [86400] 78.190.19.217.in-addr.arpa. domain name pointer 190-78.access.witcom.de [86400] 79.190.19.217.in-addr.arpa. domain name pointer 190-79.access.witcom.de [86400] 80.190.19.217.in-addr.arpa. domain name pointer 190-80.access.witcom.de [86400] 81.190.19.217.in-addr.arpa. domain name pointer 190-81.access.witcom.de [86400] 82.190.19.217.in-addr.arpa. domain name pointer 190-82.access.witcom.de [86400] 83.190.19.217.in-addr.arpa. domain name pointer 190-83.access.witcom.de [86400] 84.190.19.217.in-addr.arpa. domain name pointer 190-84.access.witcom.de [86400] 85.190.19.217.in-addr.arpa. domain name pointer 190-85.access.witcom.de [86400] 86.190.19.217.in-addr.arpa. domain name pointer 190-86.access.witcom.de [86400] 87.190.19.217.in-addr.arpa. domain name pointer 190-87.access.witcom.de [86400] 88.190.19.217.in-addr.arpa. domain name pointer 190-88.access.witcom.de [86400] 89.190.19.217.in-addr.arpa. domain name pointer 190-89.access.witcom.de [86400] 90.190.19.217.in-addr.arpa. domain name pointer 190-90.access.witcom.de [86400] 91.190.19.217.in-addr.arpa. domain name pointer 190-91.access.witcom.de [86400] 92.190.19.217.in-addr.arpa. domain name pointer 190-92.access.witcom.de [86400] 93.190.19.217.in-addr.arpa. domain name pointer 190-93.access.witcom.de [86400] 94.190.19.217.in-addr.arpa. domain name pointer 190-94.access.witcom.de [86400] 95.190.19.217.in-addr.arpa. domain name pointer 190-95.access.witcom.de [86400] 96.190.19.217.in-addr.arpa. domain name pointer 190-96.access.witcom.de [86400] 97.190.19.217.in-addr.arpa. domain name pointer 190-97.access.witcom.de [86400] 98.190.19.217.in-addr.arpa. domain name pointer 190-98.access.witcom.de [86400] 99.190.19.217.in-addr.arpa. domain name pointer 190-99.access.witcom.de [86400] 100.190.19.217.in-addr.arpa. domain name pointer romeow.ges-systemhaus.de [86400] 101.190.19.217.in-addr.arpa. domain name pointer 190-101.access.witcom.de [86400] 102.190.19.217.in-addr.arpa. domain name pointer 190-102.access.witcom.de [86400] 103.190.19.217.in-addr.arpa. domain name pointer 190-103.access.witcom.de [86400] 104.190.19.217.in-addr.arpa. domain name pointer 190-104.access.witcom.de [86400] 105.190.19.217.in-addr.arpa. domain name pointer 190-105.access.witcom.de [86400] 106.190.19.217.in-addr.arpa. domain name pointer mail11.ges-systemhaus.de [86400] 107.190.19.217.in-addr.arpa. domain name pointer mail21.ges-systemhaus.de [86400] 108.190.19.217.in-addr.arpa. domain name pointer mail31.ges-systemhaus.de [86400] 109.190.19.217.in-addr.arpa. domain name pointer mail41.ges-systemhaus.de [86400] 110.190.19.217.in-addr.arpa. domain name pointer 190-110.access.witcom.de [86400] 111.190.19.217.in-addr.arpa. domain name pointer 190-111.access.witcom.de [86400] 112.190.19.217.in-addr.arpa. domain name pointer 190-112.access.witcom.de [86400] 113.190.19.217.in-addr.arpa. domain name pointer 190-113.access.witcom.de [86400] 114.190.19.217.in-addr.arpa. domain name pointer 190-114.access.witcom.de [86400] 115.190.19.217.in-addr.arpa. domain name pointer 190-115.access.witcom.de [86400] 116.190.19.217.in-addr.arpa. domain name pointer 190-116.access.witcom.de [86400] 117.190.19.217.in-addr.arpa. domain name pointer 190-117.access.witcom.de [86400] 118.190.19.217.in-addr.arpa. domain name pointer 190-118.access.witcom.de [86400] 119.190.19.217.in-addr.arpa. domain name pointer 190-119.access.witcom.de [86400] 120.190.19.217.in-addr.arpa. domain name pointer 190-120.access.witcom.de [86400] 121.190.19.217.in-addr.arpa. domain name pointer 190-121.access.witcom.de [86400] 122.190.19.217.in-addr.arpa. domain name pointer 190-122.access.witcom.de [86400] 123.190.19.217.in-addr.arpa. domain name pointer mail4.ges-systemhaus.de [86400] 124.190.19.217.in-addr.arpa. domain name pointer 190-124.access.witcom.de [86400] 125.190.19.217.in-addr.arpa. domain name pointer 190-125.access.witcom.de [86400] 126.190.19.217.in-addr.arpa. domain name pointer mail3.ges-systemhaus.de [86400] 127.190.19.217.in-addr.arpa. domain name pointer 190-127.access.witcom.de [86400] 128.190.19.217.in-addr.arpa. domain name pointer 190-128.access.witcom.de [86400] 129.190.19.217.in-addr.arpa. domain name pointer 190-129.access.witcom.de [86400] 130.190.19.217.in-addr.arpa. domain name pointer 190-130.access.witcom.de [86400] 131.190.19.217.in-addr.arpa. domain name pointer 190-131.access.witcom.de [86400] 132.190.19.217.in-addr.arpa. domain name pointer 190-132.access.witcom.de [86400] 133.190.19.217.in-addr.arpa. domain name pointer 190-133.access.witcom.de [86400] 134.190.19.217.in-addr.arpa. domain name pointer 190-134.access.witcom.de [86400] 135.190.19.217.in-addr.arpa. domain name pointer 190-135.access.witcom.de [86400] 136.190.19.217.in-addr.arpa. domain name pointer 190-136.access.witcom.de [86400] 137.190.19.217.in-addr.arpa. domain name pointer 190-137.access.witcom.de [86400] 138.190.19.217.in-addr.arpa. domain name pointer 190-138.access.witcom.de [86400] 139.190.19.217.in-addr.arpa. domain name pointer 190-139.access.witcom.de [86400] 140.190.19.217.in-addr.arpa. domain name pointer mail-2.bkk-ruv.de [86400] 141.190.19.217.in-addr.arpa. domain name pointer 190-141.access.witcom.de [86400] 142.190.19.217.in-addr.arpa. domain name pointer mail-1.bkk-ruv.de [86400] 143.190.19.217.in-addr.arpa. domain name pointer 190-143.access.witcom.de [86400] 144.190.19.217.in-addr.arpa. domain name pointer 190-144.access.witcom.de [86400] 145.190.19.217.in-addr.arpa. domain name pointer 190-145.access.witcom.de [86400] 146.190.19.217.in-addr.arpa. domain name pointer 190-146.access.witcom.de [86400] 147.190.19.217.in-addr.arpa. domain name pointer 190-147.access.witcom.de [86400] 148.190.19.217.in-addr.arpa. domain name pointer 190-148.access.witcom.de [86400] 149.190.19.217.in-addr.arpa. domain name pointer 190-149.access.witcom.de [86400] 150.190.19.217.in-addr.arpa. domain name pointer 190-150.access.witcom.de [86400] 151.190.19.217.in-addr.arpa. domain name pointer 190-151.access.witcom.de [86400] 152.190.19.217.in-addr.arpa. domain name pointer 190-152.access.witcom.de [86400] 153.190.19.217.in-addr.arpa. domain name pointer 190-153.access.witcom.de [86400] 154.190.19.217.in-addr.arpa. domain name pointer 190-154.access.witcom.de [86400] 155.190.19.217.in-addr.arpa. domain name pointer 190-155.access.witcom.de [86400] 156.190.19.217.in-addr.arpa. domain name pointer 190-156.access.witcom.de [86400] 157.190.19.217.in-addr.arpa. domain name pointer 190-157.access.witcom.de [86400] 158.190.19.217.in-addr.arpa. domain name pointer 190-158.access.witcom.de [86400] 159.190.19.217.in-addr.arpa. domain name pointer 190-159.access.witcom.de [86400] 160.190.19.217.in-addr.arpa. domain name pointer 190-160.access.witcom.de [86400] 161.190.19.217.in-addr.arpa. domain name pointer 190-161.access.witcom.de [86400] 162.190.19.217.in-addr.arpa. domain name pointer 190-162.access.witcom.de [86400] 163.190.19.217.in-addr.arpa. domain name pointer 190-163.access.witcom.de [86400] 164.190.19.217.in-addr.arpa. domain name pointer 190-164.access.witcom.de [86400] 165.190.19.217.in-addr.arpa. domain name pointer 190-165.access.witcom.de [86400] 166.190.19.217.in-addr.arpa. domain name pointer 190-166.access.witcom.de [86400] 167.190.19.217.in-addr.arpa. domain name pointer 190-167.access.witcom.de [86400] 168.190.19.217.in-addr.arpa. domain name pointer 190-168.access.witcom.de [86400] 169.190.19.217.in-addr.arpa. domain name pointer 190-169.access.witcom.de [86400] 170.190.19.217.in-addr.arpa. domain name pointer 190-170.access.witcom.de [86400] 171.190.19.217.in-addr.arpa. domain name pointer 190-171.access.witcom.de [86400] 172.190.19.217.in-addr.arpa. domain name pointer 190-172.access.witcom.de [86400] 173.190.19.217.in-addr.arpa. domain name pointer 190-173.access.witcom.de [86400] 174.190.19.217.in-addr.arpa. domain name pointer 190-174.access.witcom.de [86400] 175.190.19.217.in-addr.arpa. domain name pointer 190-175.access.witcom.de [86400] 176.190.19.217.in-addr.arpa. domain name pointer 190-176.access.witcom.de [86400] 177.190.19.217.in-addr.arpa. domain name pointer 190-177.access.witcom.de [86400] 178.190.19.217.in-addr.arpa. domain name pointer 190-178.access.witcom.de [86400] 179.190.19.217.in-addr.arpa. domain name pointer 190-179.access.witcom.de [86400] 180.190.19.217.in-addr.arpa. domain name pointer 190-180.access.witcom.de [86400] 181.190.19.217.in-addr.arpa. domain name pointer 190-181.access.witcom.de [86400] 182.190.19.217.in-addr.arpa. domain name pointer 190-182.access.witcom.de [86400] 183.190.19.217.in-addr.arpa. domain name pointer 190-183.access.witcom.de [86400] 184.190.19.217.in-addr.arpa. domain name pointer 190-184.access.witcom.de [86400] 185.190.19.217.in-addr.arpa. domain name pointer 190-185.access.witcom.de [86400] 186.190.19.217.in-addr.arpa. domain name pointer 190-186.access.witcom.de [86400] 187.190.19.217.in-addr.arpa. domain name pointer 190-187.access.witcom.de [86400] 188.190.19.217.in-addr.arpa. domain name pointer 190-188.access.witcom.de [86400] 189.190.19.217.in-addr.arpa. domain name pointer 190-189.access.witcom.de [86400] 190.190.19.217.in-addr.arpa. domain name pointer 190-190.access.witcom.de [86400] 191.190.19.217.in-addr.arpa. domain name pointer 190-191.access.witcom.de [86400] 192.190.19.217.in-addr.arpa. domain name pointer 190-192.access.witcom.de [86400] 193.190.19.217.in-addr.arpa. domain name pointer 190-193.access.witcom.de [86400] 194.190.19.217.in-addr.arpa. domain name pointer 190-194.access.witcom.de [86400] 195.190.19.217.in-addr.arpa. domain name pointer 190-195.access.witcom.de [86400] 196.190.19.217.in-addr.arpa. domain name pointer 190-196.access.witcom.de [86400] 197.190.19.217.in-addr.arpa. domain name pointer 190-197.access.witcom.de [86400] 198.190.19.217.in-addr.arpa. domain name pointer 190-198.access.witcom.de [86400] 199.190.19.217.in-addr.arpa. domain name pointer 190-199.access.witcom.de [86400] 200.190.19.217.in-addr.arpa. domain name pointer 190-200.access.witcom.de [86400] 201.190.19.217.in-addr.arpa. domain name pointer 190-201.access.witcom.de [86400] 202.190.19.217.in-addr.arpa. domain name pointer 190-202.access.witcom.de [86400] 203.190.19.217.in-addr.arpa. domain name pointer 190-203.access.witcom.de [86400] 204.190.19.217.in-addr.arpa. domain name pointer 190-204.access.witcom.de [86400] 205.190.19.217.in-addr.arpa. domain name pointer 190-205.access.witcom.de [86400] 206.190.19.217.in-addr.arpa. domain name pointer 190-206.access.witcom.de [86400] 207.190.19.217.in-addr.arpa. domain name pointer 190-207.access.witcom.de [86400] 208.190.19.217.in-addr.arpa. domain name pointer 190-208.access.witcom.de [86400] 209.190.19.217.in-addr.arpa. domain name pointer 190-209.access.witcom.de [86400] 210.190.19.217.in-addr.arpa. domain name pointer 190-210.access.witcom.de [86400] 211.190.19.217.in-addr.arpa. domain name pointer 190-211.access.witcom.de [86400] 212.190.19.217.in-addr.arpa. domain name pointer 190-212.access.witcom.de [86400] 213.190.19.217.in-addr.arpa. domain name pointer 190-213.access.witcom.de [86400] 214.190.19.217.in-addr.arpa. domain name pointer 190-214.access.witcom.de [86400] 215.190.19.217.in-addr.arpa. domain name pointer 190-215.access.witcom.de [86400] 216.190.19.217.in-addr.arpa. domain name pointer 190-216.access.witcom.de [86400] 217.190.19.217.in-addr.arpa. domain name pointer 190-217.access.witcom.de [86400] 218.190.19.217.in-addr.arpa. domain name pointer 190-218.access.witcom.de [86400] 219.190.19.217.in-addr.arpa. domain name pointer 190-219.access.witcom.de [86400] 220.190.19.217.in-addr.arpa. domain name pointer 190-220.access.witcom.de [86400] 221.190.19.217.in-addr.arpa. domain name pointer 190-221.access.witcom.de [86400] 222.190.19.217.in-addr.arpa. domain name pointer 190-222.access.witcom.de [86400] 223.190.19.217.in-addr.arpa. domain name pointer 190-223.access.witcom.de [86400] 224.190.19.217.in-addr.arpa. domain name pointer 190-224.access.witcom.de [86400] 225.190.19.217.in-addr.arpa. domain name pointer 190-225.access.witcom.de [86400] 226.190.19.217.in-addr.arpa. domain name pointer 190-226.access.witcom.de [86400] 227.190.19.217.in-addr.arpa. domain name pointer 190-227.access.witcom.de [86400] 228.190.19.217.in-addr.arpa. domain name pointer 190-228.access.witcom.de [86400] 229.190.19.217.in-addr.arpa. domain name pointer 190-229.access.witcom.de [86400] 230.190.19.217.in-addr.arpa. domain name pointer 190-230.access.witcom.de [86400] 231.190.19.217.in-addr.arpa. domain name pointer 190-231.access.witcom.de [86400] 232.190.19.217.in-addr.arpa. domain name pointer 190-232.access.witcom.de [86400] 233.190.19.217.in-addr.arpa. domain name pointer 190-233.access.witcom.de [86400] 234.190.19.217.in-addr.arpa. domain name pointer 190-234.access.witcom.de [86400] 235.190.19.217.in-addr.arpa. domain name pointer 190-235.access.witcom.de [86400] 236.190.19.217.in-addr.arpa. domain name pointer 190-236.access.witcom.de [86400] 237.190.19.217.in-addr.arpa. domain name pointer 190-237.access.witcom.de [86400] 238.190.19.217.in-addr.arpa. domain name pointer 190-238.access.witcom.de [86400] 239.190.19.217.in-addr.arpa. domain name pointer 190-239.access.witcom.de [86400] 240.190.19.217.in-addr.arpa. domain name pointer 190-240.access.witcom.de [86400] 241.190.19.217.in-addr.arpa. domain name pointer 190-241.access.witcom.de [86400] 242.190.19.217.in-addr.arpa. domain name pointer 190-242.access.witcom.de [86400] 243.190.19.217.in-addr.arpa. domain name pointer 190-243.access.witcom.de [86400] 244.190.19.217.in-addr.arpa. domain name pointer 190-244.access.witcom.de [86400] 245.190.19.217.in-addr.arpa. domain name pointer 190-245.access.witcom.de [86400] 246.190.19.217.in-addr.arpa. domain name pointer 190-246.access.witcom.de [86400] 247.190.19.217.in-addr.arpa. domain name pointer 190-247.access.witcom.de [86400] 248.190.19.217.in-addr.arpa. domain name pointer 190-248.access.witcom.de [86400] 249.190.19.217.in-addr.arpa. domain name pointer 190-249.access.witcom.de [86400] 250.190.19.217.in-addr.arpa. domain name pointer 190-250.access.witcom.de [86400] 251.190.19.217.in-addr.arpa. domain name pointer 190-251.access.witcom.de [86400] 252.190.19.217.in-addr.arpa. domain name pointer 190-252.access.witcom.de [86400] 253.190.19.217.in-addr.arpa. domain name pointer 190-253.access.witcom.de [86400] 254.190.19.217.in-addr.arpa. domain name pointer 190-254.access.witcom.de [0] 255.190.19.217.in-addr.arpa.: domain name does not exist