[0] 0.147.200.207.in-addr.arpa.: domain name does not exist
[900] 1.147.200.207.in-addr.arpa. domain name pointer cra1.ppp.ucc-net.ca
[900] 2.147.200.207.in-addr.arpa. domain name pointer cra2.ppp.ucc-net.ca
[900] 3.147.200.207.in-addr.arpa. domain name pointer cra3.ppp.ucc-net.ca
[900] 4.147.200.207.in-addr.arpa. domain name pointer cra4.ppp.ucc-net.ca
[900] 5.147.200.207.in-addr.arpa. domain name pointer cra5.ppp.ucc-net.ca
[900] 6.147.200.207.in-addr.arpa. domain name pointer cra6.ppp.ucc-net.ca
[900] 7.147.200.207.in-addr.arpa. domain name pointer cra7.ppp.ucc-net.ca
[900] 8.147.200.207.in-addr.arpa. domain name pointer cra8.ppp.ucc-net.ca
[900] 9.147.200.207.in-addr.arpa. domain name pointer cra9.ppp.ucc-net.ca
[900] 10.147.200.207.in-addr.arpa. domain name pointer cra10.ppp.ucc-net.ca
[900] 11.147.200.207.in-addr.arpa. domain name pointer cra11.ppp.ucc-net.ca
[900] 12.147.200.207.in-addr.arpa. domain name pointer cra12.ppp.ucc-net.ca
[900] 13.147.200.207.in-addr.arpa. domain name pointer cra13.ppp.ucc-net.ca
[900] 14.147.200.207.in-addr.arpa. domain name pointer cra14.ppp.ucc-net.ca
[900] 15.147.200.207.in-addr.arpa. domain name pointer cra15.ppp.ucc-net.ca
[900] 16.147.200.207.in-addr.arpa. domain name pointer cra16.ppp.ucc-net.ca
[900] 17.147.200.207.in-addr.arpa. domain name pointer cra17.ppp.ucc-net.ca
[900] 18.147.200.207.in-addr.arpa. domain name pointer cra18.ppp.ucc-net.ca
[900] 19.147.200.207.in-addr.arpa. domain name pointer cra19.ppp.ucc-net.ca
[900] 20.147.200.207.in-addr.arpa. domain name pointer cra20.ppp.ucc-net.ca
[900] 21.147.200.207.in-addr.arpa. domain name pointer cra21.ppp.ucc-net.ca
[900] 22.147.200.207.in-addr.arpa. domain name pointer cra22.ppp.ucc-net.ca
[900] 23.147.200.207.in-addr.arpa. domain name pointer cra23.ppp.ucc-net.ca
[900] 24.147.200.207.in-addr.arpa. domain name pointer cra24.ppp.ucc-net.ca
[900] 25.147.200.207.in-addr.arpa. domain name pointer cra25.ppp.ucc-net.ca
[900] 26.147.200.207.in-addr.arpa. domain name pointer cra26.ppp.ucc-net.ca
[900] 27.147.200.207.in-addr.arpa. domain name pointer cra27.ppp.ucc-net.ca
[900] 28.147.200.207.in-addr.arpa. domain name pointer cra28.ppp.ucc-net.ca
[900] 29.147.200.207.in-addr.arpa. domain name pointer cra29.ppp.ucc-net.ca
[900] 30.147.200.207.in-addr.arpa. domain name pointer cra30.ppp.ucc-net.ca
[900] 31.147.200.207.in-addr.arpa. domain name pointer cra31.ppp.ucc-net.ca
[900] 32.147.200.207.in-addr.arpa. domain name pointer cra32.ppp.ucc-net.ca
[900] 33.147.200.207.in-addr.arpa. domain name pointer cra33.ppp.ucc-net.ca
[900] 34.147.200.207.in-addr.arpa. domain name pointer cra34.ppp.ucc-net.ca
[900] 35.147.200.207.in-addr.arpa. domain name pointer cra35.ppp.ucc-net.ca
[900] 36.147.200.207.in-addr.arpa. domain name pointer cra36.ppp.ucc-net.ca
[900] 37.147.200.207.in-addr.arpa. domain name pointer cra37.ppp.ucc-net.ca
[900] 38.147.200.207.in-addr.arpa. domain name pointer cra38.ppp.ucc-net.ca
[900] 39.147.200.207.in-addr.arpa. domain name pointer cra39.ppp.ucc-net.ca
[900] 40.147.200.207.in-addr.arpa. domain name pointer cra40.ppp.ucc-net.ca
[900] 41.147.200.207.in-addr.arpa. domain name pointer cra41.ppp.ucc-net.ca
[900] 42.147.200.207.in-addr.arpa. domain name pointer cra42.ppp.ucc-net.ca
[900] 43.147.200.207.in-addr.arpa. domain name pointer cra43.ppp.ucc-net.ca
[900] 44.147.200.207.in-addr.arpa. domain name pointer cra44.ppp.ucc-net.ca
[900] 45.147.200.207.in-addr.arpa. domain name pointer cra45.ppp.ucc-net.ca
[900] 46.147.200.207.in-addr.arpa. domain name pointer cra46.ppp.ucc-net.ca
[900] 47.147.200.207.in-addr.arpa. domain name pointer cra47.ppp.ucc-net.ca
[900] 48.147.200.207.in-addr.arpa. domain name pointer cra48.ppp.ucc-net.ca
[900] 49.147.200.207.in-addr.arpa. domain name pointer cra49.ppp.ucc-net.ca
[900] 50.147.200.207.in-addr.arpa. domain name pointer cra50.ppp.ucc-net.ca
[900] 51.147.200.207.in-addr.arpa. domain name pointer cra51.ppp.ucc-net.ca
[900] 52.147.200.207.in-addr.arpa. domain name pointer cra52.ppp.ucc-net.ca
[900] 53.147.200.207.in-addr.arpa. domain name pointer cra53.ppp.ucc-net.ca
[900] 54.147.200.207.in-addr.arpa. domain name pointer cra54.ppp.ucc-net.ca
[900] 55.147.200.207.in-addr.arpa. domain name pointer cra55.ppp.ucc-net.ca
[900] 56.147.200.207.in-addr.arpa. domain name pointer cra56.ppp.ucc-net.ca
[900] 57.147.200.207.in-addr.arpa. domain name pointer cra57.ppp.ucc-net.ca
[900] 58.147.200.207.in-addr.arpa. domain name pointer cra58.ppp.ucc-net.ca
[900] 59.147.200.207.in-addr.arpa. domain name pointer cra59.ppp.ucc-net.ca
[900] 60.147.200.207.in-addr.arpa. domain name pointer cra60.ppp.ucc-net.ca
[900] 61.147.200.207.in-addr.arpa. domain name pointer cra61.ppp.ucc-net.ca
[900] 62.147.200.207.in-addr.arpa. domain name pointer cra62.ppp.ucc-net.ca
[900] 63.147.200.207.in-addr.arpa. domain name pointer cra63.ppp.ucc-net.ca
[900] 64.147.200.207.in-addr.arpa. domain name pointer cra64.ppp.ucc-net.ca
[900] 65.147.200.207.in-addr.arpa. domain name pointer cra65.ppp.ucc-net.ca
[900] 66.147.200.207.in-addr.arpa. domain name pointer cra66.ppp.ucc-net.ca
[900] 67.147.200.207.in-addr.arpa. domain name pointer cra67.ppp.ucc-net.ca
[900] 68.147.200.207.in-addr.arpa. domain name pointer cra68.ppp.ucc-net.ca
[900] 69.147.200.207.in-addr.arpa. domain name pointer cra69.ppp.ucc-net.ca
[900] 70.147.200.207.in-addr.arpa. domain name pointer cra70.ppp.ucc-net.ca
[900] 71.147.200.207.in-addr.arpa. domain name pointer cra71.ppp.ucc-net.ca
[900] 72.147.200.207.in-addr.arpa. domain name pointer cra72.ppp.ucc-net.ca
[900] 73.147.200.207.in-addr.arpa. domain name pointer cra73.ppp.ucc-net.ca
[900] 74.147.200.207.in-addr.arpa. domain name pointer cra74.ppp.ucc-net.ca
[900] 75.147.200.207.in-addr.arpa. domain name pointer cra75.ppp.ucc-net.ca
[900] 76.147.200.207.in-addr.arpa. domain name pointer cra76.ppp.ucc-net.ca
[900] 77.147.200.207.in-addr.arpa. domain name pointer cra77.ppp.ucc-net.ca
[900] 78.147.200.207.in-addr.arpa. domain name pointer cra78.ppp.ucc-net.ca
[900] 79.147.200.207.in-addr.arpa. domain name pointer cra79.ppp.ucc-net.ca
[900] 80.147.200.207.in-addr.arpa. domain name pointer cra80.ppp.ucc-net.ca
[900] 81.147.200.207.in-addr.arpa. domain name pointer cra81.ppp.ucc-net.ca
[900] 82.147.200.207.in-addr.arpa. domain name pointer cra82.ppp.ucc-net.ca
[900] 83.147.200.207.in-addr.arpa. domain name pointer cra83.ppp.ucc-net.ca
[900] 84.147.200.207.in-addr.arpa. domain name pointer cra84.ppp.ucc-net.ca
[900] 85.147.200.207.in-addr.arpa. domain name pointer cra85.ppp.ucc-net.ca
[900] 86.147.200.207.in-addr.arpa. domain name pointer cra86.ppp.ucc-net.ca
[900] 87.147.200.207.in-addr.arpa. domain name pointer cra87.ppp.ucc-net.ca
[900] 88.147.200.207.in-addr.arpa. domain name pointer cra88.ppp.ucc-net.ca
[900] 89.147.200.207.in-addr.arpa. domain name pointer cra89.ppp.ucc-net.ca
[900] 90.147.200.207.in-addr.arpa. domain name pointer cra90.ppp.ucc-net.ca
[900] 91.147.200.207.in-addr.arpa. domain name pointer cra91.ppp.ucc-net.ca
[900] 92.147.200.207.in-addr.arpa. domain name pointer cra92.ppp.ucc-net.ca
[0] 93.147.200.207.in-addr.arpa.: domain name does not exist
[0] 94.147.200.207.in-addr.arpa.: domain name does not exist
[0] 95.147.200.207.in-addr.arpa.: domain name does not exist
[0] 96.147.200.207.in-addr.arpa.: domain name does not exist
[0] 97.147.200.207.in-addr.arpa.: domain name does not exist
[0] 98.147.200.207.in-addr.arpa.: domain name does not exist
[0] 99.147.200.207.in-addr.arpa.: domain name does not exist
[0] 100.147.200.207.in-addr.arpa.: domain name does not exist
[0] 101.147.200.207.in-addr.arpa.: domain name does not exist
[0] 102.147.200.207.in-addr.arpa.: domain name does not exist
[0] 103.147.200.207.in-addr.arpa.: domain name does not exist
[0] 104.147.200.207.in-addr.arpa.: domain name does not exist
[0] 105.147.200.207.in-addr.arpa.: domain name does not exist
[0] 106.147.200.207.in-addr.arpa.: domain name does not exist
[0] 107.147.200.207.in-addr.arpa.: domain name does not exist
[0] 108.147.200.207.in-addr.arpa.: domain name does not exist
[0] 109.147.200.207.in-addr.arpa.: domain name does not exist
[0] 110.147.200.207.in-addr.arpa.: domain name does not exist
[0] 111.147.200.207.in-addr.arpa.: domain name does not exist
[0] 112.147.200.207.in-addr.arpa.: domain name does not exist
[0] 113.147.200.207.in-addr.arpa.: domain name does not exist
[0] 114.147.200.207.in-addr.arpa.: domain name does not exist
[0] 115.147.200.207.in-addr.arpa.: domain name does not exist
[0] 116.147.200.207.in-addr.arpa.: domain name does not exist
[0] 117.147.200.207.in-addr.arpa.: domain name does not exist
[0] 118.147.200.207.in-addr.arpa.: domain name does not exist
[0] 119.147.200.207.in-addr.arpa.: domain name does not exist
[0] 120.147.200.207.in-addr.arpa.: domain name does not exist
[0] 121.147.200.207.in-addr.arpa.: domain name does not exist
[0] 122.147.200.207.in-addr.arpa.: domain name does not exist
[0] 123.147.200.207.in-addr.arpa.: domain name does not exist
[0] 124.147.200.207.in-addr.arpa.: domain name does not exist
[0] 125.147.200.207.in-addr.arpa.: domain name does not exist
[0] 126.147.200.207.in-addr.arpa.: domain name does not exist
[0] 127.147.200.207.in-addr.arpa.: domain name does not exist
[0] 128.147.200.207.in-addr.arpa.: domain name does not exist
[900] 129.147.200.207.in-addr.arpa. domain name pointer tra1.ppp.ucc-net.ca
[900] 130.147.200.207.in-addr.arpa. domain name pointer tra2.ppp.ucc-net.ca
[900] 131.147.200.207.in-addr.arpa. domain name pointer tra3.ppp.ucc-net.ca
[900] 132.147.200.207.in-addr.arpa. domain name pointer tra4.ppp.ucc-net.ca
[900] 133.147.200.207.in-addr.arpa. domain name pointer tra5.ppp.ucc-net.ca
[900] 134.147.200.207.in-addr.arpa. domain name pointer tra6.ppp.ucc-net.ca
[900] 135.147.200.207.in-addr.arpa. domain name pointer tra7.ppp.ucc-net.ca
[900] 136.147.200.207.in-addr.arpa. domain name pointer tra8.ppp.ucc-net.ca
[900] 137.147.200.207.in-addr.arpa. domain name pointer tra9.ppp.ucc-net.ca
[900] 138.147.200.207.in-addr.arpa. domain name pointer tra10.ppp.ucc-net.ca
[900] 139.147.200.207.in-addr.arpa. domain name pointer tra11.ppp.ucc-net.ca
[900] 140.147.200.207.in-addr.arpa. domain name pointer tra12.ppp.ucc-net.ca
[900] 141.147.200.207.in-addr.arpa. domain name pointer tra13.ppp.ucc-net.ca
[900] 142.147.200.207.in-addr.arpa. domain name pointer tra14.ppp.ucc-net.ca
[900] 143.147.200.207.in-addr.arpa. domain name pointer tra15.ppp.ucc-net.ca
[900] 144.147.200.207.in-addr.arpa. domain name pointer tra16.ppp.ucc-net.ca
[900] 145.147.200.207.in-addr.arpa. domain name pointer tra17.ppp.ucc-net.ca
[900] 146.147.200.207.in-addr.arpa. domain name pointer tra18.ppp.ucc-net.ca
[900] 147.147.200.207.in-addr.arpa. domain name pointer tra19.ppp.ucc-net.ca
[900] 148.147.200.207.in-addr.arpa. domain name pointer tra20.ppp.ucc-net.ca
[900] 149.147.200.207.in-addr.arpa. domain name pointer tra21.ppp.ucc-net.ca
[900] 150.147.200.207.in-addr.arpa. domain name pointer tra22.ppp.ucc-net.ca
[900] 151.147.200.207.in-addr.arpa. domain name pointer tra23.ppp.ucc-net.ca
[900] 152.147.200.207.in-addr.arpa. domain name pointer tra24.ppp.ucc-net.ca
[900] 153.147.200.207.in-addr.arpa. domain name pointer tra25.ppp.ucc-net.ca
[900] 154.147.200.207.in-addr.arpa. domain name pointer tra26.ppp.ucc-net.ca
[900] 155.147.200.207.in-addr.arpa. domain name pointer tra27.ppp.ucc-net.ca
[900] 156.147.200.207.in-addr.arpa. domain name pointer tra28.ppp.ucc-net.ca
[900] 157.147.200.207.in-addr.arpa. domain name pointer tra29.ppp.ucc-net.ca
[900] 158.147.200.207.in-addr.arpa. domain name pointer tra30.ppp.ucc-net.ca
[900] 159.147.200.207.in-addr.arpa. domain name pointer tra31.ppp.ucc-net.ca
[900] 160.147.200.207.in-addr.arpa. domain name pointer tra32.ppp.ucc-net.ca
[900] 161.147.200.207.in-addr.arpa. domain name pointer tra33.ppp.ucc-net.ca
[900] 162.147.200.207.in-addr.arpa. domain name pointer tra34.ppp.ucc-net.ca
[900] 163.147.200.207.in-addr.arpa. domain name pointer tra35.ppp.ucc-net.ca
[900] 164.147.200.207.in-addr.arpa. domain name pointer tra36.ppp.ucc-net.ca
[900] 165.147.200.207.in-addr.arpa. domain name pointer tra37.ppp.ucc-net.ca
[900] 166.147.200.207.in-addr.arpa. domain name pointer tra38.ppp.ucc-net.ca
[900] 167.147.200.207.in-addr.arpa. domain name pointer tra39.ppp.ucc-net.ca
[900] 168.147.200.207.in-addr.arpa. domain name pointer tra40.ppp.ucc-net.ca
[900] 169.147.200.207.in-addr.arpa. domain name pointer tra41.ppp.ucc-net.ca
[900] 170.147.200.207.in-addr.arpa. domain name pointer tra42.ppp.ucc-net.ca
[900] 171.147.200.207.in-addr.arpa. domain name pointer tra43.ppp.ucc-net.ca
[900] 172.147.200.207.in-addr.arpa. domain name pointer tra44.ppp.ucc-net.ca
[900] 173.147.200.207.in-addr.arpa. domain name pointer tra45.ppp.ucc-net.ca
[900] 174.147.200.207.in-addr.arpa. domain name pointer tra46.ppp.ucc-net.ca
[900] 175.147.200.207.in-addr.arpa. domain name pointer tra47.ppp.ucc-net.ca
[900] 176.147.200.207.in-addr.arpa. domain name pointer tra48.ppp.ucc-net.ca
[900] 177.147.200.207.in-addr.arpa. domain name pointer tra49.ppp.ucc-net.ca
[900] 178.147.200.207.in-addr.arpa. domain name pointer tra50.ppp.ucc-net.ca
[900] 179.147.200.207.in-addr.arpa. domain name pointer tra51.ppp.ucc-net.ca
[900] 180.147.200.207.in-addr.arpa. domain name pointer tra52.ppp.ucc-net.ca
[900] 181.147.200.207.in-addr.arpa. domain name pointer tra53.ppp.ucc-net.ca
[900] 182.147.200.207.in-addr.arpa. domain name pointer tra54.ppp.ucc-net.ca
[900] 183.147.200.207.in-addr.arpa. domain name pointer tra55.ppp.ucc-net.ca
[900] 184.147.200.207.in-addr.arpa. domain name pointer tra56.ppp.ucc-net.ca
[900] 185.147.200.207.in-addr.arpa. domain name pointer tra57.ppp.ucc-net.ca
[900] 186.147.200.207.in-addr.arpa. domain name pointer tra58.ppp.ucc-net.ca
[900] 187.147.200.207.in-addr.arpa. domain name pointer tra59.ppp.ucc-net.ca
[900] 188.147.200.207.in-addr.arpa. domain name pointer tra60.ppp.ucc-net.ca
[900] 189.147.200.207.in-addr.arpa. domain name pointer tra61.ppp.ucc-net.ca
[900] 190.147.200.207.in-addr.arpa. domain name pointer tra62.ppp.ucc-net.ca
[900] 191.147.200.207.in-addr.arpa. domain name pointer tra63.ppp.ucc-net.ca
[900] 192.147.200.207.in-addr.arpa. domain name pointer tra64.ppp.ucc-net.ca
[900] 193.147.200.207.in-addr.arpa. domain name pointer tra65.ppp.ucc-net.ca
[900] 194.147.200.207.in-addr.arpa. domain name pointer tra66.ppp.ucc-net.ca
[900] 195.147.200.207.in-addr.arpa. domain name pointer tra67.ppp.ucc-net.ca
[900] 196.147.200.207.in-addr.arpa. domain name pointer tra68.ppp.ucc-net.ca
[900] 197.147.200.207.in-addr.arpa. domain name pointer tra69.ppp.ucc-net.ca
[900] 198.147.200.207.in-addr.arpa. domain name pointer tra70.ppp.ucc-net.ca
[900] 199.147.200.207.in-addr.arpa. domain name pointer tra71.ppp.ucc-net.ca
[900] 200.147.200.207.in-addr.arpa. domain name pointer tra72.ppp.ucc-net.ca
[900] 201.147.200.207.in-addr.arpa. domain name pointer tra73.ppp.ucc-net.ca
[900] 202.147.200.207.in-addr.arpa. domain name pointer tra74.ppp.ucc-net.ca
[900] 203.147.200.207.in-addr.arpa. domain name pointer tra75.ppp.ucc-net.ca
[900] 204.147.200.207.in-addr.arpa. domain name pointer tra76.ppp.ucc-net.ca
[900] 205.147.200.207.in-addr.arpa. domain name pointer tra77.ppp.ucc-net.ca
[900] 206.147.200.207.in-addr.arpa. domain name pointer tra78.ppp.ucc-net.ca
[900] 207.147.200.207.in-addr.arpa. domain name pointer tra79.ppp.ucc-net.ca
[900] 208.147.200.207.in-addr.arpa. domain name pointer tra80.ppp.ucc-net.ca
[900] 209.147.200.207.in-addr.arpa. domain name pointer tra81.ppp.ucc-net.ca
[900] 210.147.200.207.in-addr.arpa. domain name pointer tra82.ppp.ucc-net.ca
[900] 211.147.200.207.in-addr.arpa. domain name pointer tra83.ppp.ucc-net.ca
[900] 212.147.200.207.in-addr.arpa. domain name pointer tra84.ppp.ucc-net.ca
[900] 213.147.200.207.in-addr.arpa. domain name pointer tra85.ppp.ucc-net.ca
[900] 214.147.200.207.in-addr.arpa. domain name pointer tra86.ppp.ucc-net.ca
[900] 215.147.200.207.in-addr.arpa. domain name pointer tra87.ppp.ucc-net.ca
[900] 216.147.200.207.in-addr.arpa. domain name pointer tra88.ppp.ucc-net.ca
[900] 217.147.200.207.in-addr.arpa. domain name pointer tra89.ppp.ucc-net.ca
[900] 218.147.200.207.in-addr.arpa. domain name pointer tra90.ppp.ucc-net.ca
[900] 219.147.200.207.in-addr.arpa. domain name pointer tra91.ppp.ucc-net.ca
[0] 220.147.200.207.in-addr.arpa.: domain name does not exist
[0] 221.147.200.207.in-addr.arpa.: domain name does not exist
[0] 222.147.200.207.in-addr.arpa.: domain name does not exist
[0] 223.147.200.207.in-addr.arpa.: domain name does not exist
[0] 224.147.200.207.in-addr.arpa.: domain name does not exist
[0] 225.147.200.207.in-addr.arpa.: domain name does not exist
[0] 226.147.200.207.in-addr.arpa.: domain name does not exist
[0] 227.147.200.207.in-addr.arpa.: domain name does not exist
[0] 228.147.200.207.in-addr.arpa.: domain name does not exist
[0] 229.147.200.207.in-addr.arpa.: domain name does not exist
[0] 230.147.200.207.in-addr.arpa.: domain name does not exist
[0] 231.147.200.207.in-addr.arpa.: domain name does not exist
[0] 232.147.200.207.in-addr.arpa.: domain name does not exist
[0] 233.147.200.207.in-addr.arpa.: domain name does not exist
[0] 234.147.200.207.in-addr.arpa.: domain name does not exist
[0] 235.147.200.207.in-addr.arpa.: domain name does not exist
[0] 236.147.200.207.in-addr.arpa.: domain name does not exist
[0] 237.147.200.207.in-addr.arpa.: domain name does not exist
[0] 238.147.200.207.in-addr.arpa.: domain name does not exist
[0] 239.147.200.207.in-addr.arpa.: domain name does not exist
[0] 240.147.200.207.in-addr.arpa.: domain name does not exist
[0] 241.147.200.207.in-addr.arpa.: domain name does not exist
[0] 242.147.200.207.in-addr.arpa.: domain name does not exist
[0] 243.147.200.207.in-addr.arpa.: domain name does not exist
[0] 244.147.200.207.in-addr.arpa.: domain name does not exist
[0] 245.147.200.207.in-addr.arpa.: domain name does not exist
[0] 246.147.200.207.in-addr.arpa.: domain name does not exist
[0] 247.147.200.207.in-addr.arpa.: domain name does not exist
[0] 248.147.200.207.in-addr.arpa.: domain name does not exist
[0] 249.147.200.207.in-addr.arpa.: domain name does not exist
[0] 250.147.200.207.in-addr.arpa.: domain name does not exist
[0] 251.147.200.207.in-addr.arpa.: domain name does not exist
[0] 252.147.200.207.in-addr.arpa.: domain name does not exist
[0] 253.147.200.207.in-addr.arpa.: domain name does not exist
[0] 254.147.200.207.in-addr.arpa.: domain name does not exist
[0] 255.147.200.207.in-addr.arpa.: domain name does not exist