[86400] 0.152.84.192.in-addr.arpa. domain name pointer INFNET27-LAN.le.infn.it
[86400] 1.152.84.192.in-addr.arpa. domain name pointer dns.le.infn.it
[86400] 2.152.84.192.in-addr.arpa. domain name pointer scr-reserved.le.infn.it
[86400] 3.152.84.192.in-addr.arpa. domain name pointer astro06.le.infn.it
[86400] 4.152.84.192.in-addr.arpa. domain name pointer lx06.le.infn.it
[86400] 5.152.84.192.in-addr.arpa. domain name pointer lidar.le.infn.it
[86400] 6.152.84.192.in-addr.arpa. domain name pointer awg710.le.infn.it
[86400] 7.152.84.192.in-addr.arpa. domain name pointer lx07.le.infn.it
[86400] 8.152.84.192.in-addr.arpa. domain name pointer lap-nassisi.le.infn.it
[86400] 9.152.84.192.in-addr.arpa. domain name pointer controller-laser.le.infn.it
[0] 10.152.84.192.in-addr.arpa.: domain name does not exist
[0] 11.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 12.152.84.192.in-addr.arpa. domain name pointer pc-fiore.le.infn.it
[86400] 13.152.84.192.in-addr.arpa. domain name pointer lap-fonti2.le.infn.it
[86400] 14.152.84.192.in-addr.arpa. domain name pointer detomasi.le.infn.it
[86400] 15.152.84.192.in-addr.arpa. domain name pointer auger-le32.le.infn.it
[86400] 16.152.84.192.in-addr.arpa. domain name pointer pcp-depaolis.le.infn.it
[86400] 17.152.84.192.in-addr.arpa. domain name pointer pda-panareo.le.infn.it
[86400] 18.152.84.192.in-addr.arpa. domain name pointer mag.le.infn.it
[0] 19.152.84.192.in-addr.arpa.: domain name does not exist
[0] 20.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 21.152.84.192.in-addr.arpa. domain name pointer fisicarad8.le.infn.it
[86400] 22.152.84.192.in-addr.arpa. domain name pointer note-marsella.le.infn.it
[86400] 23.152.84.192.in-addr.arpa. domain name pointer pc-labastro5.le.infn.it
[86400] 24.152.84.192.in-addr.arpa. domain name pointer pc-labastro6.le.infn.it
[86400] 25.152.84.192.in-addr.arpa. domain name pointer pc-labastro8.le.infn.it
[86400] 26.152.84.192.in-addr.arpa. domain name pointer pcp-sarah.le.infn.it
[86400] 27.152.84.192.in-addr.arpa. domain name pointer pc-labastro11.le.infn.it
[86400] 28.152.84.192.in-addr.arpa. domain name pointer pc-labele3.le.infn.it
[86400] 29.152.84.192.in-addr.arpa. domain name pointer pcp-bmaiolo.le.infn.it
[86400] 30.152.84.192.in-addr.arpa. domain name pointer temper.le.infn.it
[0] 31.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 32.152.84.192.in-addr.arpa. domain name pointer dampe.le.infn.it
[86400] 33.152.84.192.in-addr.arpa. domain name pointer star2.le.infn.it
[86400] 34.152.84.192.in-addr.arpa. domain name pointer joe.le.infn.it
[86400] 35.152.84.192.in-addr.arpa. domain name pointer surdo.le.infn.it
[86400] 36.152.84.192.in-addr.arpa. domain name pointer dinoi.le.infn.it
[86400] 37.152.84.192.in-addr.arpa. domain name pointer giove.le.infn.it
[86400] 38.152.84.192.in-addr.arpa. domain name pointer granny.le.infn.it
[86400] 39.152.84.192.in-addr.arpa. domain name pointer ljc-astrolab.le.infn.it
[86400] 40.152.84.192.in-addr.arpa. domain name pointer afs01.le.infn.it
[86400] 41.152.84.192.in-addr.arpa. domain name pointer server1.le.infn.it
[86400] 42.152.84.192.in-addr.arpa. domain name pointer depaolis.le.infn.it
[86400] 43.152.84.192.in-addr.arpa. domain name pointer jamesbond2.le.infn.it
[86400] 44.152.84.192.in-addr.arpa. domain name pointer webafs.le.infn.it
[86400] 45.152.84.192.in-addr.arpa. domain name pointer rbpi.le.infn.it
[86400] 46.152.84.192.in-addr.arpa. domain name pointer skype.le.infn.it
[86400] 47.152.84.192.in-addr.arpa. domain name pointer pc-grancagnolo.le.infn.it
[86400] 48.152.84.192.in-addr.arpa. domain name pointer pc-guido.le.infn.it
[86400] 49.152.84.192.in-addr.arpa. domain name pointer pc-martino.le.infn.it
[86400] 50.152.84.192.in-addr.arpa. domain name pointer mrcoluccia.le.infn.it
[86400] 51.152.84.192.in-addr.arpa. domain name pointer hp-fonti.le.infn.it
[86400] 52.152.84.192.in-addr.arpa. domain name pointer apu2.le.infn.it
[86400] 53.152.84.192.in-addr.arpa. domain name pointer pcp-burlizzi.le.infn.it
[86400] 54.152.84.192.in-addr.arpa. domain name pointer ruby.le.infn.it
[86400] 55.152.84.192.in-addr.arpa. domain name pointer pc-fonti2.le.infn.it
[86400] 56.152.84.192.in-addr.arpa. domain name pointer hp800ps.le.infn.it
[86400] 57.152.84.192.in-addr.arpa. domain name pointer eletapp7.le.infn.it
[86400] 58.152.84.192.in-addr.arpa. domain name pointer pcp-raleo.le.infn.it
[0] 59.152.84.192.in-addr.arpa.: domain name does not exist
[0] 60.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 61.152.84.192.in-addr.arpa. domain name pointer epson850.le.infn.it
[86400] 62.152.84.192.in-addr.arpa. domain name pointer bergamo.le.infn.it
[86400] 63.152.84.192.in-addr.arpa. domain name pointer console.le.infn.it
[86400] 64.152.84.192.in-addr.arpa. domain name pointer pc-mega.le.infn.it
[86400] 65.152.84.192.in-addr.arpa. domain name pointer pc-assiro.le.infn.it
[86400] 66.152.84.192.in-addr.arpa. domain name pointer lap-perrone.le.infn.it
[86400] 67.152.84.192.in-addr.arpa. domain name pointer lap-danna.le.infn.it
[86400] 68.152.84.192.in-addr.arpa. domain name pointer pcp-boiti2.le.infn.it
[86400] 69.152.84.192.in-addr.arpa. domain name pointer dottorandi4.le.infn.it
[86400] 70.152.84.192.in-addr.arpa. domain name pointer deangelis.le.infn.it
[86400] 71.152.84.192.in-addr.arpa. domain name pointer pb-gorini.le.infn.it
[86400] 72.152.84.192.in-addr.arpa. domain name pointer mailssl.le.infn.it
[86400] 73.152.84.192.in-addr.arpa. domain name pointer gerardi2.le.infn.it
[86400] 74.152.84.192.in-addr.arpa. domain name pointer pc-strafella.le.infn.it
[86400] 75.152.84.192.in-addr.arpa. domain name pointer pc-nassisi.le.infn.it
[86400] 76.152.84.192.in-addr.arpa. domain name pointer pc-solombrino.le.infn.it
[86400] 77.152.84.192.in-addr.arpa. domain name pointer panareo.le.infn.it
[86400] 78.152.84.192.in-addr.arpa. domain name pointer pc-einstein1.le.infn.it
[86400] 79.152.84.192.in-addr.arpa. domain name pointer aula-cesaroni.le.infn.it
[86400] 80.152.84.192.in-addr.arpa. domain name pointer pc-labele1.le.infn.it
[86400] 81.152.84.192.in-addr.arpa. domain name pointer TripAP.le.infn.it
[86400] 82.152.84.192.in-addr.arpa. domain name pointer ups.le.infn.it
[86400] 83.152.84.192.in-addr.arpa. domain name pointer babilonia.le.infn.it
[86400] 84.152.84.192.in-addr.arpa. domain name pointer orologio.le.infn.it
[86400] 85.152.84.192.in-addr.arpa. domain name pointer lll-3.le.infn.it
[86400] 86.152.84.192.in-addr.arpa. domain name pointer pc-einstein2.le.infn.it
[86400] 87.152.84.192.in-addr.arpa. domain name pointer pc-garola.le.infn.it
[0] 88.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 89.152.84.192.in-addr.arpa. domain name pointer leggieri.le.infn.it
[0] 90.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 91.152.84.192.in-addr.arpa. domain name pointer alex-pc.le.infn.it
[86400] 92.152.84.192.in-addr.arpa. domain name pointer pc-didattica4.le.infn.it
[0] 93.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 94.152.84.192.in-addr.arpa. domain name pointer wperrone.le.infn.it
[86400] 95.152.84.192.in-addr.arpa. domain name pointer ts.le.infn.it
[86400] 96.152.84.192.in-addr.arpa. domain name pointer auger-le64.le.infn.it
[86400] 97.152.84.192.in-addr.arpa. domain name pointer pc-montani.le.infn.it
[86400] 98.152.84.192.in-addr.arpa. domain name pointer pc-brigida.le.infn.it
[86400] 99.152.84.192.in-addr.arpa. domain name pointer pcp-elisa.le.infn.it
[86400] 100.152.84.192.in-addr.arpa. domain name pointer syslog.le.infn.it
[86400] 101.152.84.192.in-addr.arpa. domain name pointer pc-eletapp3.le.infn.it
[86400] 102.152.84.192.in-addr.arpa. domain name pointer pcp-delia.le.infn.it
[0] 103.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 104.152.84.192.in-addr.arpa. domain name pointer fiji.le.infn.it
[86400] 105.152.84.192.in-addr.arpa. domain name pointer astro03.le.infn.it
[86400] 106.152.84.192.in-addr.arpa. domain name pointer pcp-fiore.le.infn.it
[86400] 107.152.84.192.in-addr.arpa. domain name pointer picariello.le.infn.it
[86400] 108.152.84.192.in-addr.arpa. domain name pointer pc-labastro1.le.infn.it
[86400] 109.152.84.192.in-addr.arpa. domain name pointer pc-labastro2.le.infn.it
[86400] 110.152.84.192.in-addr.arpa. domain name pointer pc-labastro3.le.infn.it
[0] 111.152.84.192.in-addr.arpa.: domain name does not exist
[0] 112.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 113.152.84.192.in-addr.arpa. domain name pointer ap-lae.le.infn.it
[86400] 114.152.84.192.in-addr.arpa. domain name pointer mac-perrino.le.infn.it
[86400] 115.152.84.192.in-addr.arpa. domain name pointer osc-tds.le.infn.it
[86400] 116.152.84.192.in-addr.arpa. domain name pointer pc-perrone.le.infn.it
[86400] 117.152.84.192.in-addr.arpa. domain name pointer pcp-meg06.le.infn.it
[0] 118.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 119.152.84.192.in-addr.arpa. domain name pointer lll-5.le.infn.it
[86400] 120.152.84.192.in-addr.arpa. domain name pointer pc-dedonno2.le.infn.it
[86400] 121.152.84.192.in-addr.arpa. domain name pointer augerLE.le.infn.it
[86400] 122.152.84.192.in-addr.arpa. domain name pointer leonardo.le.infn.it
[86400] 123.152.84.192.in-addr.arpa. domain name pointer mac-coriano.le.infn.it
[86400] 124.152.84.192.in-addr.arpa. domain name pointer rotelli.le.infn.it
[86400] 125.152.84.192.in-addr.arpa. domain name pointer alex.le.infn.it
[86400] 126.152.84.192.in-addr.arpa. domain name pointer niobe.le.infn.it
[86400] 127.152.84.192.in-addr.arpa. domain name pointer ui.le.infn.it
[86400] 128.152.84.192.in-addr.arpa. domain name pointer oj-boiti2.le.infn.it
[86400] 129.152.84.192.in-addr.arpa. domain name pointer enrico-iPAQ.le.infn.it
[86400] 130.152.84.192.in-addr.arpa. domain name pointer voip-scr.le.infn.it
[86400] 131.152.84.192.in-addr.arpa. domain name pointer pc-gaetani.le.infn.it
[86400] 132.152.84.192.in-addr.arpa. domain name pointer pcp-guida.le.infn.it
[86400] 133.152.84.192.in-addr.arpa. domain name pointer pcp-bochicchio.le.infn.it
[0] 134.152.84.192.in-addr.arpa.: domain name does not exist
[0] 135.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 136.152.84.192.in-addr.arpa. domain name pointer xsolaris.le.infn.it
[86400] 137.152.84.192.in-addr.arpa. domain name pointer gaslab-2.le.infn.it
[86400] 138.152.84.192.in-addr.arpa. domain name pointer HPcad.le.infn.it
[86400] 139.152.84.192.in-addr.arpa. domain name pointer gaslab-3.le.infn.it
[86400] 140.152.84.192.in-addr.arpa. domain name pointer install.le.infn.it
[86400] 141.152.84.192.in-addr.arpa. domain name pointer install2.le.infn.it
[86400] 142.152.84.192.in-addr.arpa. domain name pointer pcp-garola.le.infn.it
[86400] 143.152.84.192.in-addr.arpa. domain name pointer pc-prinari.le.infn.it
[86400] 144.152.84.192.in-addr.arpa. domain name pointer pc-einstein3.le.infn.it
[86400] 145.152.84.192.in-addr.arpa. domain name pointer schmidt.le.infn.it
[86400] 146.152.84.192.in-addr.arpa. domain name pointer dottorandi5.le.infn.it
[86400] 147.152.84.192.in-addr.arpa. domain name pointer pc-degiorgi.le.infn.it
[86400] 148.152.84.192.in-addr.arpa. domain name pointer afs02.le.infn.it
[0] 149.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 150.152.84.192.in-addr.arpa. domain name pointer pc-ingrosso.le.infn.it
[86400] 151.152.84.192.in-addr.arpa. domain name pointer crisbe.le.infn.it
[86400] 152.152.84.192.in-addr.arpa. domain name pointer velardi.le.infn.it
[86400] 153.152.84.192.in-addr.arpa. domain name pointer python-lab.le.infn.it
[86400] 154.152.84.192.in-addr.arpa. domain name pointer pc-scolarici.le.infn.it
[86400] 155.152.84.192.in-addr.arpa. domain name pointer pc-nicolardi.le.infn.it
[86400] 156.152.84.192.in-addr.arpa. domain name pointer pcp-atlas01.le.infn.it
[86400] 157.152.84.192.in-addr.arpa. domain name pointer pc-corrado.le.infn.it
[86400] 158.152.84.192.in-addr.arpa. domain name pointer pc-espfisica2-a.le.infn.it
[86400] 159.152.84.192.in-addr.arpa. domain name pointer fds-test.le.infn.it
[86400] 160.152.84.192.in-addr.arpa. domain name pointer pc-fpga.le.infn.it
[0] 161.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 162.152.84.192.in-addr.arpa. domain name pointer pc-eletapp2.le.infn.it
[86400] 163.152.84.192.in-addr.arpa. domain name pointer gasperini.le.infn.it
[86400] 164.152.84.192.in-addr.arpa. domain name pointer pc-tommasi.le.infn.it
[86400] 165.152.84.192.in-addr.arpa. domain name pointer pc-lidar.le.infn.it
[86400] 166.152.84.192.in-addr.arpa. domain name pointer nico.le.infn.it
[86400] 167.152.84.192.in-addr.arpa. domain name pointer pc-espfisica2-b.le.infn.it
[86400] 168.152.84.192.in-addr.arpa. domain name pointer pc-orofino.le.infn.it
[86400] 169.152.84.192.in-addr.arpa. domain name pointer nlite.le.infn.it
[86400] 170.152.84.192.in-addr.arpa. domain name pointer print-didattica-01.le.infn.it
[86400] 171.152.84.192.in-addr.arpa. domain name pointer pcp-anna.le.infn.it
[86400] 172.152.84.192.in-addr.arpa. domain name pointer pc-telescopio.le.infn.it
[86400] 173.152.84.192.in-addr.arpa. domain name pointer tla-715.le.infn.it
[86400] 174.152.84.192.in-addr.arpa. domain name pointer pc-edanna.le.infn.it
[86400] 175.152.84.192.in-addr.arpa. domain name pointer pc-mleo.le.infn.it
[86400] 176.152.84.192.in-addr.arpa. domain name pointer pc-dinno2.le.infn.it
[86400] 177.152.84.192.in-addr.arpa. domain name pointer pc-delia.le.infn.it
[86400] 178.152.84.192.in-addr.arpa. domain name pointer carofalo.le.infn.it
[86400] 179.152.84.192.in-addr.arpa. domain name pointer pc-guidoa.le.infn.it
[86400] 180.152.84.192.in-addr.arpa. domain name pointer pc-didattica11.le.infn.it
[86400] 181.152.84.192.in-addr.arpa. domain name pointer pc-eletapp1.le.infn.it
[86400] 182.152.84.192.in-addr.arpa. domain name pointer pc-einstein4.le.infn.it
[86400] 183.152.84.192.in-addr.arpa. domain name pointer edvige.le.infn.it
[86400] 184.152.84.192.in-addr.arpa. domain name pointer hermes.le.infn.it
[86400] 185.152.84.192.in-addr.arpa. domain name pointer eletcad.le.infn.it
[86400] 186.152.84.192.in-addr.arpa. domain name pointer pcp-romualdo.le.infn.it
[86400] 187.152.84.192.in-addr.arpa. domain name pointer bd1.le.infn.it
[86400] 188.152.84.192.in-addr.arpa. domain name pointer pcp-tafuro.le.infn.it
[86400] 189.152.84.192.in-addr.arpa. domain name pointer pc-cannone.le.infn.it
[0] 190.152.84.192.in-addr.arpa.: domain name does not exist
[0] 191.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 192.152.84.192.in-addr.arpa. domain name pointer Switch-FARM-A.le.infn.it
[86400] 193.152.84.192.in-addr.arpa. domain name pointer Switch-FARM-B.le.infn.it
[86400] 194.152.84.192.in-addr.arpa. domain name pointer Switch-CAD.le.infn.it
[86400] 195.152.84.192.in-addr.arpa. domain name pointer Switch-CED-A.le.infn.it
[86400] 196.152.84.192.in-addr.arpa. domain name pointer Switch-CED-B.le.infn.it
[86400] 197.152.84.192.in-addr.arpa. domain name pointer Switch-CED-C.le.infn.it
[86400] 198.152.84.192.in-addr.arpa. domain name pointer Switch-INFOLAB.le.infn.it
[86400] 199.152.84.192.in-addr.arpa. domain name pointer fw.le.infn.it
[86400] 200.152.84.192.in-addr.arpa. domain name pointer Switch-LAE.le.infn.it
[0] 201.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 202.152.84.192.in-addr.arpa. domain name pointer LWAstroLab.le.infn.it
[0] 203.152.84.192.in-addr.arpa.: domain name does not exist
[0] 204.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 205.152.84.192.in-addr.arpa. domain name pointer lae01.le.infn.it
[86400] 206.152.84.192.in-addr.arpa. domain name pointer hp-eletlab.le.infn.it
[0] 207.152.84.192.in-addr.arpa.: domain name does not exist
[0] 208.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 209.152.84.192.in-addr.arpa. domain name pointer installa.le.infn.it
[86400] 210.152.84.192.in-addr.arpa. domain name pointer pcp-solombrino.le.infn.it
[86400] 211.152.84.192.in-addr.arpa. domain name pointer pcp-tacconella.le.infn.it
[0] 212.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 213.152.84.192.in-addr.arpa. domain name pointer eqlab2.le.infn.it
[86400] 214.152.84.192.in-addr.arpa. domain name pointer panda.le.infn.it
[86400] 215.152.84.192.in-addr.arpa. domain name pointer amminfn01.le.infn.it
[86400] 216.152.84.192.in-addr.arpa. domain name pointer amminfn02.le.infn.it
[86400] 217.152.84.192.in-addr.arpa. domain name pointer amminfn03.le.infn.it
[86400] 218.152.84.192.in-addr.arpa. domain name pointer fonti3.le.infn.it
[86400] 219.152.84.192.in-addr.arpa. domain name pointer amminfn04.le.infn.it
[86400] 220.152.84.192.in-addr.arpa. domain name pointer pc-depaolis.le.infn.it
[86400] 221.152.84.192.in-addr.arpa. domain name pointer qbit.le.infn.it
[86400] 222.152.84.192.in-addr.arpa. domain name pointer webserver.le.infn.it
[86400] 223.152.84.192.in-addr.arpa. domain name pointer mac-gorini.le.infn.it
[86400] 224.152.84.192.in-addr.arpa. domain name pointer landolfi.le.infn.it
[86400] 225.152.84.192.in-addr.arpa. domain name pointer gpco.le.infn.it
[86400] 226.152.84.192.in-addr.arpa. domain name pointer cadm2.le.infn.it
[86400] 227.152.84.192.in-addr.arpa. domain name pointer cadm1.le.infn.it
[86400] 228.152.84.192.in-addr.arpa. domain name pointer pc-debonis2.le.infn.it
[86400] 229.152.84.192.in-addr.arpa. domain name pointer videomeeting.le.infn.it
[86400] 230.152.84.192.in-addr.arpa. domain name pointer videoconf.le.infn.it
[86400] 231.152.84.192.in-addr.arpa. domain name pointer direzione-dip.le.infn.it
[86400] 232.152.84.192.in-addr.arpa. domain name pointer pc-helab1.le.infn.it
[86400] 233.152.84.192.in-addr.arpa. domain name pointer skypeconf.le.infn.it
[86400] 234.152.84.192.in-addr.arpa. domain name pointer meg-server.le.infn.it
[86400] 235.152.84.192.in-addr.arpa. domain name pointer pc-perrino.le.infn.it
[86400] 236.152.84.192.in-addr.arpa. domain name pointer enrico.le.infn.it
[86400] 237.152.84.192.in-addr.arpa. domain name pointer pcp-grancagnolo.le.infn.it
[86400] 238.152.84.192.in-addr.arpa. domain name pointer splendido2.le.infn.it
[0] 239.152.84.192.in-addr.arpa.: domain name does not exist
[0] 240.152.84.192.in-addr.arpa.: domain name does not exist
[0] 241.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 242.152.84.192.in-addr.arpa. domain name pointer pc-didattica11.le.infn.it
[86400] 243.152.84.192.in-addr.arpa. domain name pointer mac-spagnolo.le.infn.it
[86400] 244.152.84.192.in-addr.arpa. domain name pointer pc-luches.le.infn.it
[86400] 245.152.84.192.in-addr.arpa. domain name pointer pcp-didattica.le.infn.it
[86400] 246.152.84.192.in-addr.arpa. domain name pointer pc-acquaviva.le.infn.it
[86400] 247.152.84.192.in-addr.arpa. domain name pointer fisicarad2.le.infn.it
[86400] 248.152.84.192.in-addr.arpa. domain name pointer ananke.le.infn.it
[86400] 249.152.84.192.in-addr.arpa. domain name pointer DEChub.le.infn.it.152.84.192.in-addr.arpa
[86400] 250.152.84.192.in-addr.arpa. domain name pointer gw-conferences.le.infn.it
[86400] 251.152.84.192.in-addr.arpa. domain name pointer star4.le.infn.it
[0] 252.152.84.192.in-addr.arpa.: domain name does not exist
[86400] 253.152.84.192.in-addr.arpa. domain name pointer gw-atm.le.infn.it
[86400] 254.152.84.192.in-addr.arpa. domain name pointer bd2.le.infn.it
[0] 255.152.84.192.in-addr.arpa.: domain name does not exist