[0] 0.140.136.213.in-addr.arpa.: domain name does not exist [300] 1.140.136.213.in-addr.arpa. domain name pointer net-140-1.noicomnet.it [300] 2.140.136.213.in-addr.arpa. domain name pointer sw1-bb-mia-vlan301.noicomnet.it [300] 3.140.136.213.in-addr.arpa. domain name pointer sw2-bb-mia-vlan301.noicomnet.it [300] 4.140.136.213.in-addr.arpa. domain name pointer net-140-4.noicomnet.it [300] 5.140.136.213.in-addr.arpa. domain name pointer net-140-5.noicomnet.it [300] 6.140.136.213.in-addr.arpa. domain name pointer net-140-6.noicomnet.it [300] 7.140.136.213.in-addr.arpa. domain name pointer net-140-7.noicomnet.it [300] 8.140.136.213.in-addr.arpa. domain name pointer net-140-8.noicomnet.it [300] 9.140.136.213.in-addr.arpa. domain name pointer net-140-9.noicomnet.it [300] 10.140.136.213.in-addr.arpa. domain name pointer net-140-10.noicomnet.it [300] 11.140.136.213.in-addr.arpa. domain name pointer net-140-11.noicomnet.it [300] 12.140.136.213.in-addr.arpa. domain name pointer vmuxmi1.noicomnet.it [300] 13.140.136.213.in-addr.arpa. domain name pointer vmuxmi2.noicomnet.it [300] 14.140.136.213.in-addr.arpa. domain name pointer vmuxcw.noicomnet.it [300] 15.140.136.213.in-addr.arpa. domain name pointer net-140-15.noicomnet.it [300] 16.140.136.213.in-addr.arpa. domain name pointer net-140-16.noicomnet.it [300] 17.140.136.213.in-addr.arpa. domain name pointer net-140-17.noicomnet.it [300] 18.140.136.213.in-addr.arpa. domain name pointer net-140-18.noicomnet.it [300] 19.140.136.213.in-addr.arpa. domain name pointer net-140-19.noicomnet.it [300] 20.140.136.213.in-addr.arpa. domain name pointer net-140-20.noicomnet.it [300] 21.140.136.213.in-addr.arpa. domain name pointer net-140-21.noicomnet.it [300] 22.140.136.213.in-addr.arpa. domain name pointer net-140-22.noicomnet.it [300] 23.140.136.213.in-addr.arpa. domain name pointer net-140-23.noicomnet.it [300] 24.140.136.213.in-addr.arpa. domain name pointer net-140-24.noicomnet.it [300] 25.140.136.213.in-addr.arpa. domain name pointer net-140-25.noicomnet.it [300] 26.140.136.213.in-addr.arpa. domain name pointer net-140-26.noicomnet.it [300] 27.140.136.213.in-addr.arpa. domain name pointer net-140-27.noicomnet.it [300] 28.140.136.213.in-addr.arpa. domain name pointer net-140-28.noicomnet.it [300] 29.140.136.213.in-addr.arpa. domain name pointer net-140-29.noicomnet.it [300] 30.140.136.213.in-addr.arpa. domain name pointer net-140-30.noicomnet.it [300] 31.140.136.213.in-addr.arpa. domain name pointer net-140-31.noicomnet.it [300] 32.140.136.213.in-addr.arpa. domain name pointer net-140-32.noicomnet.it [300] 33.140.136.213.in-addr.arpa. domain name pointer net-140-33.noicomnet.it [300] 34.140.136.213.in-addr.arpa. domain name pointer net-140-34.noicomnet.it [300] 35.140.136.213.in-addr.arpa. domain name pointer net-140-35.noicomnet.it [300] 36.140.136.213.in-addr.arpa. domain name pointer net-140-36.noicomnet.it [300] 37.140.136.213.in-addr.arpa. domain name pointer net-140-37.noicomnet.it [300] 38.140.136.213.in-addr.arpa. domain name pointer net-140-38.noicomnet.it [300] 39.140.136.213.in-addr.arpa. domain name pointer net-140-39.noicomnet.it [300] 40.140.136.213.in-addr.arpa. domain name pointer net-140-40.noicomnet.it [300] 41.140.136.213.in-addr.arpa. domain name pointer net-140-41.noicomnet.it [300] 42.140.136.213.in-addr.arpa. domain name pointer net-140-42.noicomnet.it [300] 43.140.136.213.in-addr.arpa. domain name pointer net-140-43.noicomnet.it [300] 44.140.136.213.in-addr.arpa. domain name pointer net-140-44.noicomnet.it [300] 45.140.136.213.in-addr.arpa. domain name pointer net-140-45.noicomnet.it [300] 46.140.136.213.in-addr.arpa. domain name pointer net-140-46.noicomnet.it [300] 47.140.136.213.in-addr.arpa. domain name pointer net-140-47.noicomnet.it [300] 48.140.136.213.in-addr.arpa. domain name pointer net-140-48.noicomnet.it [300] 49.140.136.213.in-addr.arpa. domain name pointer net-140-49.noicomnet.it [300] 50.140.136.213.in-addr.arpa. domain name pointer net-140-50.noicomnet.it [300] 51.140.136.213.in-addr.arpa. domain name pointer net-140-51.noicomnet.it [300] 52.140.136.213.in-addr.arpa. domain name pointer net-140-52.noicomnet.it [300] 53.140.136.213.in-addr.arpa. domain name pointer net-140-53.noicomnet.it [300] 54.140.136.213.in-addr.arpa. domain name pointer net-140-54.noicomnet.it [300] 55.140.136.213.in-addr.arpa. domain name pointer net-140-55.noicomnet.it [300] 56.140.136.213.in-addr.arpa. domain name pointer net-140-56.noicomnet.it [300] 57.140.136.213.in-addr.arpa. domain name pointer net-140-57.noicomnet.it [300] 58.140.136.213.in-addr.arpa. domain name pointer net-140-58.noicomnet.it [300] 59.140.136.213.in-addr.arpa. domain name pointer net-140-59.noicomnet.it [300] 60.140.136.213.in-addr.arpa. domain name pointer net-140-60.noicomnet.it [300] 61.140.136.213.in-addr.arpa. domain name pointer net-140-61.noicomnet.it [300] 62.140.136.213.in-addr.arpa. domain name pointer net-140-62.noicomnet.it [300] 63.140.136.213.in-addr.arpa. domain name pointer net-140-63.noicomnet.it [300] 64.140.136.213.in-addr.arpa. domain name pointer net-140-64.noicomnet.it [300] 65.140.136.213.in-addr.arpa. domain name pointer net-140-65.noicomnet.it [300] 66.140.136.213.in-addr.arpa. domain name pointer net-140-66.noicomnet.it [300] 67.140.136.213.in-addr.arpa. domain name pointer net-140-67.noicomnet.it [300] 68.140.136.213.in-addr.arpa. domain name pointer net-140-68.noicomnet.it [300] 69.140.136.213.in-addr.arpa. domain name pointer net-140-69.noicomnet.it [300] 70.140.136.213.in-addr.arpa. domain name pointer net-140-70.noicomnet.it [300] 71.140.136.213.in-addr.arpa. domain name pointer net-140-71.noicomnet.it [300] 72.140.136.213.in-addr.arpa. domain name pointer net-140-72.noicomnet.it [300] 73.140.136.213.in-addr.arpa. domain name pointer net-140-73.noicomnet.it [300] 74.140.136.213.in-addr.arpa. domain name pointer net-140-74.noicomnet.it [300] 75.140.136.213.in-addr.arpa. domain name pointer net-140-75.noicomnet.it [300] 76.140.136.213.in-addr.arpa. domain name pointer net-140-76.noicomnet.it [300] 77.140.136.213.in-addr.arpa. domain name pointer net-140-77.noicomnet.it [300] 78.140.136.213.in-addr.arpa. domain name pointer net-140-78.noicomnet.it [300] 79.140.136.213.in-addr.arpa. domain name pointer net-140-79.noicomnet.it [300] 80.140.136.213.in-addr.arpa. domain name pointer net-140-80.noicomnet.it [300] 81.140.136.213.in-addr.arpa. domain name pointer net-140-81.noicomnet.it [300] 82.140.136.213.in-addr.arpa. domain name pointer net-140-82.noicomnet.it [300] 83.140.136.213.in-addr.arpa. domain name pointer net-140-83.noicomnet.it [300] 84.140.136.213.in-addr.arpa. domain name pointer net-140-84.noicomnet.it [300] 85.140.136.213.in-addr.arpa. domain name pointer net-140-85.noicomnet.it [300] 86.140.136.213.in-addr.arpa. domain name pointer net-140-86.noicomnet.it [300] 87.140.136.213.in-addr.arpa. domain name pointer net-140-87.noicomnet.it [300] 88.140.136.213.in-addr.arpa. domain name pointer net-140-88.noicomnet.it [300] 89.140.136.213.in-addr.arpa. domain name pointer net-140-89.noicomnet.it [300] 90.140.136.213.in-addr.arpa. domain name pointer net-140-90.noicomnet.it [300] 91.140.136.213.in-addr.arpa. domain name pointer net-140-91.noicomnet.it [300] 92.140.136.213.in-addr.arpa. domain name pointer net-140-92.noicomnet.it [300] 93.140.136.213.in-addr.arpa. domain name pointer net-140-93.noicomnet.it [300] 94.140.136.213.in-addr.arpa. domain name pointer net-140-94.noicomnet.it [300] 95.140.136.213.in-addr.arpa. domain name pointer net-140-95.noicomnet.it [300] 96.140.136.213.in-addr.arpa. domain name pointer net-140-96.noicomnet.it [300] 97.140.136.213.in-addr.arpa. domain name pointer net-140-97.noicomnet.it [300] 98.140.136.213.in-addr.arpa. domain name pointer net-140-98.noicomnet.it [300] 99.140.136.213.in-addr.arpa. domain name pointer net-140-99.noicomnet.it [300] 100.140.136.213.in-addr.arpa. domain name pointer net-140-100.noicomnet.it [300] 101.140.136.213.in-addr.arpa. domain name pointer net-140-101.noicomnet.it [300] 102.140.136.213.in-addr.arpa. domain name pointer net-140-102.noicomnet.it [300] 103.140.136.213.in-addr.arpa. domain name pointer net-140-103.noicomnet.it [300] 104.140.136.213.in-addr.arpa. domain name pointer net-140-104.noicomnet.it [300] 105.140.136.213.in-addr.arpa. domain name pointer net-140-105.noicomnet.it [300] 106.140.136.213.in-addr.arpa. domain name pointer net-140-106.noicomnet.it [300] 107.140.136.213.in-addr.arpa. domain name pointer net-140-107.noicomnet.it [300] 108.140.136.213.in-addr.arpa. domain name pointer net-140-108.noicomnet.it [300] 109.140.136.213.in-addr.arpa. domain name pointer net-140-109.noicomnet.it [300] 110.140.136.213.in-addr.arpa. domain name pointer net-140-110.noicomnet.it [300] 111.140.136.213.in-addr.arpa. domain name pointer net-140-111.noicomnet.it [300] 112.140.136.213.in-addr.arpa. domain name pointer net-140-112.noicomnet.it [300] 113.140.136.213.in-addr.arpa. domain name pointer net-140-113.noicomnet.it [300] 114.140.136.213.in-addr.arpa. domain name pointer net-140-114.noicomnet.it [300] 115.140.136.213.in-addr.arpa. domain name pointer net-140-115.noicomnet.it [300] 116.140.136.213.in-addr.arpa. domain name pointer net-140-116.noicomnet.it [300] 117.140.136.213.in-addr.arpa. domain name pointer net-140-117.noicomnet.it [300] 118.140.136.213.in-addr.arpa. domain name pointer net-140-118.noicomnet.it [300] 119.140.136.213.in-addr.arpa. domain name pointer net-140-119.noicomnet.it [300] 120.140.136.213.in-addr.arpa. domain name pointer net-140-120.noicomnet.it [300] 121.140.136.213.in-addr.arpa. domain name pointer net-140-121.noicomnet.it [300] 122.140.136.213.in-addr.arpa. domain name pointer net-140-122.noicomnet.it [300] 123.140.136.213.in-addr.arpa. domain name pointer net-140-123.noicomnet.it [300] 124.140.136.213.in-addr.arpa. domain name pointer net-140-124.noicomnet.it [300] 125.140.136.213.in-addr.arpa. domain name pointer net-140-125.noicomnet.it [300] 126.140.136.213.in-addr.arpa. domain name pointer net-140-126.noicomnet.it [300] 127.140.136.213.in-addr.arpa. domain name pointer net-140-127.noicomnet.it [300] 128.140.136.213.in-addr.arpa. domain name pointer net-140-128.noicomnet.it [300] 129.140.136.213.in-addr.arpa. domain name pointer net-140-129.noicomnet.it [300] 130.140.136.213.in-addr.arpa. domain name pointer net-140-130.noicomnet.it [300] 131.140.136.213.in-addr.arpa. domain name pointer net-140-131.noicomnet.it [300] 132.140.136.213.in-addr.arpa. domain name pointer net-140-132.noicomnet.it [300] 133.140.136.213.in-addr.arpa. domain name pointer net-140-133.noicomnet.it [300] 134.140.136.213.in-addr.arpa. domain name pointer net-140-134.noicomnet.it [300] 135.140.136.213.in-addr.arpa. domain name pointer net-140-135.noicomnet.it [300] 136.140.136.213.in-addr.arpa. domain name pointer net-140-136.noicomnet.it [300] 137.140.136.213.in-addr.arpa. domain name pointer net-140-137.noicomnet.it [300] 138.140.136.213.in-addr.arpa. domain name pointer net-140-138.noicomnet.it [300] 139.140.136.213.in-addr.arpa. domain name pointer net-140-139.noicomnet.it [300] 140.140.136.213.in-addr.arpa. domain name pointer net-140-140.noicomnet.it [300] 141.140.136.213.in-addr.arpa. domain name pointer net-140-141.noicomnet.it [300] 142.140.136.213.in-addr.arpa. domain name pointer net-140-142.noicomnet.it [300] 143.140.136.213.in-addr.arpa. domain name pointer net-140-143.noicomnet.it [300] 144.140.136.213.in-addr.arpa. domain name pointer net-140-144.noicomnet.it [300] 145.140.136.213.in-addr.arpa. domain name pointer net-140-145.noicomnet.it [300] 146.140.136.213.in-addr.arpa. domain name pointer net-140-146.noicomnet.it [300] 147.140.136.213.in-addr.arpa. domain name pointer net-140-147.noicomnet.it [300] 148.140.136.213.in-addr.arpa. domain name pointer net-140-148.noicomnet.it [300] 149.140.136.213.in-addr.arpa. domain name pointer net-140-149.noicomnet.it [300] 150.140.136.213.in-addr.arpa. domain name pointer net-140-150.noicomnet.it [300] 151.140.136.213.in-addr.arpa. domain name pointer net-140-151.noicomnet.it [300] 152.140.136.213.in-addr.arpa. domain name pointer net-140-152.noicomnet.it [300] 153.140.136.213.in-addr.arpa. domain name pointer net-140-153.noicomnet.it [300] 154.140.136.213.in-addr.arpa. domain name pointer net-140-154.noicomnet.it [300] 155.140.136.213.in-addr.arpa. domain name pointer net-140-155.noicomnet.it [300] 156.140.136.213.in-addr.arpa. domain name pointer net-140-156.noicomnet.it [300] 157.140.136.213.in-addr.arpa. domain name pointer net-140-157.noicomnet.it [300] 158.140.136.213.in-addr.arpa. domain name pointer net-140-158.noicomnet.it [300] 159.140.136.213.in-addr.arpa. domain name pointer net-140-159.noicomnet.it [300] 160.140.136.213.in-addr.arpa. domain name pointer net-140-160.noicomnet.it [300] 161.140.136.213.in-addr.arpa. domain name pointer net-140-161.noicomnet.it [300] 162.140.136.213.in-addr.arpa. domain name pointer net-140-162.noicomnet.it [300] 163.140.136.213.in-addr.arpa. domain name pointer net-140-163.noicomnet.it [300] 164.140.136.213.in-addr.arpa. domain name pointer net-140-164.noicomnet.it [300] 165.140.136.213.in-addr.arpa. domain name pointer net-140-165.noicomnet.it [300] 166.140.136.213.in-addr.arpa. domain name pointer net-140-166.noicomnet.it [300] 167.140.136.213.in-addr.arpa. domain name pointer net-140-167.noicomnet.it [300] 168.140.136.213.in-addr.arpa. domain name pointer net-140-168.noicomnet.it [300] 169.140.136.213.in-addr.arpa. domain name pointer net-140-169.noicomnet.it [300] 170.140.136.213.in-addr.arpa. domain name pointer net-140-170.noicomnet.it [300] 171.140.136.213.in-addr.arpa. domain name pointer net-140-171.noicomnet.it [300] 172.140.136.213.in-addr.arpa. domain name pointer net-140-172.noicomnet.it [300] 173.140.136.213.in-addr.arpa. domain name pointer net-140-173.noicomnet.it [300] 174.140.136.213.in-addr.arpa. domain name pointer net-140-174.noicomnet.it [300] 175.140.136.213.in-addr.arpa. domain name pointer net-140-175.noicomnet.it [300] 176.140.136.213.in-addr.arpa. domain name pointer net-140-176.noicomnet.it [300] 177.140.136.213.in-addr.arpa. domain name pointer net-140-177.noicomnet.it [300] 178.140.136.213.in-addr.arpa. domain name pointer net-140-178.noicomnet.it [300] 179.140.136.213.in-addr.arpa. domain name pointer net-140-179.noicomnet.it [300] 180.140.136.213.in-addr.arpa. domain name pointer net-140-180.noicomnet.it [300] 181.140.136.213.in-addr.arpa. domain name pointer net-140-181.noicomnet.it [300] 182.140.136.213.in-addr.arpa. domain name pointer net-140-182.noicomnet.it [300] 183.140.136.213.in-addr.arpa. domain name pointer net-140-183.noicomnet.it [300] 184.140.136.213.in-addr.arpa. domain name pointer net-140-184.noicomnet.it [300] 185.140.136.213.in-addr.arpa. domain name pointer net-140-185.noicomnet.it [300] 186.140.136.213.in-addr.arpa. domain name pointer net-140-186.noicomnet.it [300] 187.140.136.213.in-addr.arpa. domain name pointer net-140-187.noicomnet.it [300] 188.140.136.213.in-addr.arpa. domain name pointer net-140-188.noicomnet.it [300] 189.140.136.213.in-addr.arpa. domain name pointer net-140-189.noicomnet.it [300] 190.140.136.213.in-addr.arpa. domain name pointer net-140-190.noicomnet.it [300] 191.140.136.213.in-addr.arpa. domain name pointer net-140-191.noicomnet.it [300] 192.140.136.213.in-addr.arpa. domain name pointer net-140-192.noicomnet.it [300] 193.140.136.213.in-addr.arpa. domain name pointer net-140-193.noicomnet.it [300] 194.140.136.213.in-addr.arpa. domain name pointer net-140-194.noicomnet.it [300] 195.140.136.213.in-addr.arpa. domain name pointer net-140-195.noicomnet.it [300] 196.140.136.213.in-addr.arpa. domain name pointer net-140-196.noicomnet.it [300] 197.140.136.213.in-addr.arpa. domain name pointer net-140-197.noicomnet.it [300] 198.140.136.213.in-addr.arpa. domain name pointer net-140-198.noicomnet.it [300] 199.140.136.213.in-addr.arpa. domain name pointer net-140-199.noicomnet.it [300] 200.140.136.213.in-addr.arpa. domain name pointer net-140-200.noicomnet.it [300] 201.140.136.213.in-addr.arpa. domain name pointer net-140-201.noicomnet.it [300] 202.140.136.213.in-addr.arpa. domain name pointer net-140-202.noicomnet.it [300] 203.140.136.213.in-addr.arpa. domain name pointer net-140-203.noicomnet.it [300] 204.140.136.213.in-addr.arpa. domain name pointer net-140-204.noicomnet.it [300] 205.140.136.213.in-addr.arpa. domain name pointer net-140-205.noicomnet.it [300] 206.140.136.213.in-addr.arpa. domain name pointer net-140-206.noicomnet.it [300] 207.140.136.213.in-addr.arpa. domain name pointer net-140-207.noicomnet.it [300] 208.140.136.213.in-addr.arpa. domain name pointer net-140-208.noicomnet.it [300] 209.140.136.213.in-addr.arpa. domain name pointer net-140-209.noicomnet.it [300] 210.140.136.213.in-addr.arpa. domain name pointer net-140-210.noicomnet.it [300] 211.140.136.213.in-addr.arpa. domain name pointer net-140-211.noicomnet.it [300] 212.140.136.213.in-addr.arpa. domain name pointer net-140-212.noicomnet.it [300] 213.140.136.213.in-addr.arpa. domain name pointer net-140-213.noicomnet.it [300] 214.140.136.213.in-addr.arpa. domain name pointer net-140-214.noicomnet.it [300] 215.140.136.213.in-addr.arpa. domain name pointer net-140-215.noicomnet.it [300] 216.140.136.213.in-addr.arpa. domain name pointer net-140-216.noicomnet.it [300] 217.140.136.213.in-addr.arpa. domain name pointer net-140-217.noicomnet.it [300] 218.140.136.213.in-addr.arpa. domain name pointer net-140-218.noicomnet.it [300] 219.140.136.213.in-addr.arpa. domain name pointer net-140-219.noicomnet.it [300] 220.140.136.213.in-addr.arpa. domain name pointer net-140-220.noicomnet.it [300] 221.140.136.213.in-addr.arpa. domain name pointer net-140-221.noicomnet.it [300] 222.140.136.213.in-addr.arpa. domain name pointer net-140-222.noicomnet.it [300] 223.140.136.213.in-addr.arpa. domain name pointer net-140-223.noicomnet.it [300] 224.140.136.213.in-addr.arpa. domain name pointer net-140-224.noicomnet.it [300] 225.140.136.213.in-addr.arpa. domain name pointer net-140-225.noicomnet.it [300] 226.140.136.213.in-addr.arpa. domain name pointer net-140-226.noicomnet.it [300] 227.140.136.213.in-addr.arpa. domain name pointer net-140-227.noicomnet.it [300] 228.140.136.213.in-addr.arpa. domain name pointer net-140-228.noicomnet.it [300] 229.140.136.213.in-addr.arpa. domain name pointer net-140-229.noicomnet.it [300] 230.140.136.213.in-addr.arpa. domain name pointer net-140-230.noicomnet.it [300] 231.140.136.213.in-addr.arpa. domain name pointer net-140-231.noicomnet.it [300] 232.140.136.213.in-addr.arpa. domain name pointer net-140-232.noicomnet.it [300] 233.140.136.213.in-addr.arpa. domain name pointer net-140-233.noicomnet.it [300] 234.140.136.213.in-addr.arpa. domain name pointer net-140-234.noicomnet.it [300] 235.140.136.213.in-addr.arpa. domain name pointer net-140-235.noicomnet.it [300] 236.140.136.213.in-addr.arpa. domain name pointer net-140-236.noicomnet.it [300] 237.140.136.213.in-addr.arpa. domain name pointer net-140-237.noicomnet.it [300] 238.140.136.213.in-addr.arpa. domain name pointer net-140-238.noicomnet.it [300] 239.140.136.213.in-addr.arpa. domain name pointer net-140-239.noicomnet.it [300] 240.140.136.213.in-addr.arpa. domain name pointer net-140-240.noicomnet.it [300] 241.140.136.213.in-addr.arpa. domain name pointer net-140-241.noicomnet.it [300] 242.140.136.213.in-addr.arpa. domain name pointer net-140-242.noicomnet.it [300] 243.140.136.213.in-addr.arpa. domain name pointer net-140-243.noicomnet.it [300] 244.140.136.213.in-addr.arpa. domain name pointer net-140-244.noicomnet.it [300] 245.140.136.213.in-addr.arpa. domain name pointer net-140-245.noicomnet.it [300] 246.140.136.213.in-addr.arpa. domain name pointer net-140-246.noicomnet.it [300] 247.140.136.213.in-addr.arpa. domain name pointer net-140-247.noicomnet.it [300] 248.140.136.213.in-addr.arpa. domain name pointer net-140-248.noicomnet.it [300] 249.140.136.213.in-addr.arpa. domain name pointer net-140-249.noicomnet.it [300] 250.140.136.213.in-addr.arpa. domain name pointer net-140-250.noicomnet.it [300] 251.140.136.213.in-addr.arpa. domain name pointer net-140-251.noicomnet.it [300] 252.140.136.213.in-addr.arpa. domain name pointer net-140-252.noicomnet.it [300] 253.140.136.213.in-addr.arpa. domain name pointer net-140-253.noicomnet.it [300] 254.140.136.213.in-addr.arpa. domain name pointer net-140-254.noicomnet.it [0] 255.140.136.213.in-addr.arpa.: domain name does not exist