[0] 0.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 1.22.113.140.in-addr.arpa. domain name pointer ns.Math.NCTU.edu.tw
[0] 2.22.113.140.in-addr.arpa.: domain name does not exist
[0] 3.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 4.22.113.140.in-addr.arpa. domain name pointer board.Math.NCTU.edu.tw
[3600] 5.22.113.140.in-addr.arpa. domain name pointer Posa.Math.NCTU.edu.tw
[0] 6.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 7.22.113.140.in-addr.arpa. domain name pointer wire01.Math.NCTU.edu.tw
[3600] 8.22.113.140.in-addr.arpa. domain name pointer wire02.Math.NCTU.edu.tw
[3600] 9.22.113.140.in-addr.arpa. domain name pointer wire03.Math.NCTU.edu.tw
[0] 10.22.113.140.in-addr.arpa.: domain name does not exist
[0] 11.22.113.140.in-addr.arpa.: domain name does not exist
[0] 12.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 13.22.113.140.in-addr.arpa. domain name pointer pc207a.Math.NCTU.edu.tw
[3600] 14.22.113.140.in-addr.arpa. domain name pointer pc207b.Math.NCTU.edu.tw
[3600] 15.22.113.140.in-addr.arpa. domain name pointer pc207c.Math.NCTU.edu.tw
[0] 16.22.113.140.in-addr.arpa.: domain name does not exist
[0] 17.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 18.22.113.140.in-addr.arpa. domain name pointer davidguo.Math.NCTU.edu.tw
[3600] 19.22.113.140.in-addr.arpa. domain name pointer ulam.Math.NCTU.edu.tw
[3600] 20.22.113.140.in-addr.arpa. domain name pointer neumann.Math.NCTU.edu.tw
[3600] 21.22.113.140.in-addr.arpa. domain name pointer vpn.Math.NCTU.edu.tw
[3600] 22.22.113.140.in-addr.arpa. domain name pointer xserve.Math.NCTU.edu.tw
[0] 23.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 24.22.113.140.in-addr.arpa. domain name pointer Randy.Math.NCTU.edu.tw
[0] 25.22.113.140.in-addr.arpa.: domain name does not exist
[0] 26.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 27.22.113.140.in-addr.arpa. domain name pointer pc209c.Math.NCTU.edu.tw
[3600] 28.22.113.140.in-addr.arpa. domain name pointer billingftp.Math.NCTU.edu.tw
[3600] 29.22.113.140.in-addr.arpa. domain name pointer print29.Math.NCTU.edu.tw
[3600] 30.22.113.140.in-addr.arpa. domain name pointer pc209a.Math.NCTU.edu.tw
[3600] 31.22.113.140.in-addr.arpa. domain name pointer fw1.Math.NCTU.edu.tw
[0] 32.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 33.22.113.140.in-addr.arpa. domain name pointer cctv.Math.NCTU.edu.tw
[0] 34.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 35.22.113.140.in-addr.arpa. domain name pointer ups.Math.NCTU.edu.tw
[3600] 36.22.113.140.in-addr.arpa. domain name pointer mailspam.Math.NCTU.edu.tw
[3600] 37.22.113.140.in-addr.arpa. domain name pointer fw2.Math.NCTU.edu.tw
[0] 38.22.113.140.in-addr.arpa.: domain name does not exist
[0] 39.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 40.22.113.140.in-addr.arpa. domain name pointer integral.Math.NCTU.edu.tw
[3600] 41.22.113.140.in-addr.arpa. domain name pointer register.Math.NCTU.edu.tw
[3600] 42.22.113.140.in-addr.arpa. domain name pointer wwwbig5.Math.NCTU.edu.tw
[0] 43.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 44.22.113.140.in-addr.arpa. domain name pointer kvm.Math.NCTU.edu.tw
[3600] 45.22.113.140.in-addr.arpa. domain name pointer monitor.Math.NCTU.edu.tw
[3600] 46.22.113.140.in-addr.arpa. domain name pointer nas46.Math.NCTU.edu.tw
[3600] 47.22.113.140.in-addr.arpa. domain name pointer tengch.Math.NCTU.edu.tw
[0] 48.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 49.22.113.140.in-addr.arpa. domain name pointer sc.Math.NCTU.edu.tw
[3600] 50.22.113.140.in-addr.arpa. domain name pointer nas.Math.NCTU.edu.tw
[0] 51.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 52.22.113.140.in-addr.arpa. domain name pointer backup.Math.NCTU.edu.tw
[0] 53.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 54.22.113.140.in-addr.arpa. domain name pointer newton.Math.NCTU.edu.tw
[0] 55.22.113.140.in-addr.arpa.: domain name does not exist
[0] 56.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 57.22.113.140.in-addr.arpa. domain name pointer jupiter.Math.NCTU.edu.tw
[3600] 58.22.113.140.in-addr.arpa. domain name pointer smtp.Math.NCTU.edu.tw webmail.Math.NCTU.edu.tw mail.Math.NCTU.edu.tw Math.NCTU.edu.tw
[3600] 59.22.113.140.in-addr.arpa. domain name pointer amms.Math.NCTU.edu.tw
[3600] 60.22.113.140.in-addr.arpa. domain name pointer amcloud.Math.NCTU.edu.tw
[0] 61.22.113.140.in-addr.arpa.: domain name does not exist
[0] 62.22.113.140.in-addr.arpa.: domain name does not exist
[0] 63.22.113.140.in-addr.arpa.: domain name does not exist
[0] 64.22.113.140.in-addr.arpa.: domain name does not exist
[0] 65.22.113.140.in-addr.arpa.: domain name does not exist
[0] 66.22.113.140.in-addr.arpa.: domain name does not exist
[0] 67.22.113.140.in-addr.arpa.: domain name does not exist
[0] 68.22.113.140.in-addr.arpa.: domain name does not exist
[0] 69.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 70.22.113.140.in-addr.arpa. domain name pointer ccDHCP.Math.NCTU.edu.tw
[3600] 71.22.113.140.in-addr.arpa. domain name pointer ambsd1.Math.NCTU.edu.tw
[0] 72.22.113.140.in-addr.arpa.: domain name does not exist
[0] 73.22.113.140.in-addr.arpa.: domain name does not exist
[0] 74.22.113.140.in-addr.arpa.: domain name does not exist
[0] 75.22.113.140.in-addr.arpa.: domain name does not exist
[0] 76.22.113.140.in-addr.arpa.: domain name does not exist
[0] 77.22.113.140.in-addr.arpa.: domain name does not exist
[0] 78.22.113.140.in-addr.arpa.: domain name does not exist
[0] 79.22.113.140.in-addr.arpa.: domain name does not exist
[0] 80.22.113.140.in-addr.arpa.: domain name does not exist
[0] 81.22.113.140.in-addr.arpa.: domain name does not exist
[0] 82.22.113.140.in-addr.arpa.: domain name does not exist
[0] 83.22.113.140.in-addr.arpa.: domain name does not exist
[0] 84.22.113.140.in-addr.arpa.: domain name does not exist
[0] 85.22.113.140.in-addr.arpa.: domain name does not exist
[0] 86.22.113.140.in-addr.arpa.: domain name does not exist
[0] 87.22.113.140.in-addr.arpa.: domain name does not exist
[0] 88.22.113.140.in-addr.arpa.: domain name does not exist
[0] 89.22.113.140.in-addr.arpa.: domain name does not exist
[0] 90.22.113.140.in-addr.arpa.: domain name does not exist
[0] 91.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 92.22.113.140.in-addr.arpa. domain name pointer richliu.Math.NCTU.edu.tw
[0] 93.22.113.140.in-addr.arpa.: domain name does not exist
[0] 94.22.113.140.in-addr.arpa.: domain name does not exist
[0] 95.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 96.22.113.140.in-addr.arpa. domain name pointer slzzp.Math.NCTU.edu.tw
[3600] 97.22.113.140.in-addr.arpa. domain name pointer news.Math.NCTU.edu.tw
[3600] 98.22.113.140.in-addr.arpa. domain name pointer zhlee.Math.NCTU.edu.tw
[3600] 99.22.113.140.in-addr.arpa. domain name pointer bbs.Math.NCTU.edu.tw
[3600] 100.22.113.140.in-addr.arpa. domain name pointer clw00.Math.NCTU.edu.tw
[3600] 101.22.113.140.in-addr.arpa. domain name pointer clw01.Math.NCTU.edu.tw
[3600] 102.22.113.140.in-addr.arpa. domain name pointer clw02.Math.NCTU.edu.tw
[3600] 103.22.113.140.in-addr.arpa. domain name pointer clw03.Math.NCTU.edu.tw
[3600] 104.22.113.140.in-addr.arpa. domain name pointer clw04.Math.NCTU.edu.tw
[3600] 105.22.113.140.in-addr.arpa. domain name pointer clw05.Math.NCTU.edu.tw
[3600] 106.22.113.140.in-addr.arpa. domain name pointer clw06.Math.NCTU.edu.tw
[3600] 107.22.113.140.in-addr.arpa. domain name pointer clwjj.Math.NCTU.edu.tw
[0] 108.22.113.140.in-addr.arpa.: domain name does not exist
[0] 109.22.113.140.in-addr.arpa.: domain name does not exist
[0] 110.22.113.140.in-addr.arpa.: domain name does not exist
[0] 111.22.113.140.in-addr.arpa.: domain name does not exist
[0] 112.22.113.140.in-addr.arpa.: domain name does not exist
[0] 113.22.113.140.in-addr.arpa.: domain name does not exist
[0] 114.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 115.22.113.140.in-addr.arpa. domain name pointer EL115.Math.NCTU.edu.tw
[3600] 116.22.113.140.in-addr.arpa. domain name pointer EL116.Math.NCTU.edu.tw
[3600] 117.22.113.140.in-addr.arpa. domain name pointer EL117.Math.NCTU.edu.tw
[3600] 118.22.113.140.in-addr.arpa. domain name pointer EL118.Math.NCTU.edu.tw
[3600] 119.22.113.140.in-addr.arpa. domain name pointer EL119.Math.NCTU.edu.tw
[3600] 120.22.113.140.in-addr.arpa. domain name pointer pc225a.Math.NCTU.edu.tw
[3600] 121.22.113.140.in-addr.arpa. domain name pointer pc225b.Math.NCTU.edu.tw
[0] 122.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 123.22.113.140.in-addr.arpa. domain name pointer pc337a.Math.NCTU.edu.tw
[0] 124.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 125.22.113.140.in-addr.arpa. domain name pointer gus338.Math.NCTU.edu.tw
[3600] 126.22.113.140.in-addr.arpa. domain name pointer pc232a.Math.NCTU.edu.tw
[3600] 127.22.113.140.in-addr.arpa. domain name pointer pc232b.Math.NCTU.edu.tw
[3600] 128.22.113.140.in-addr.arpa. domain name pointer pc232c.Math.NCTU.edu.tw
[3600] 129.22.113.140.in-addr.arpa. domain name pointer pc232d.Math.NCTU.edu.tw
[3600] 130.22.113.140.in-addr.arpa. domain name pointer pc230a.Math.NCTU.edu.tw
[3600] 131.22.113.140.in-addr.arpa. domain name pointer pc200b.Math.NCTU.edu.tw
[3600] 132.22.113.140.in-addr.arpa. domain name pointer pc200a.Math.NCTU.edu.tw
[3600] 133.22.113.140.in-addr.arpa. domain name pointer pc239b.Math.NCTU.edu.tw
[3600] 134.22.113.140.in-addr.arpa. domain name pointer pc227a.Math.NCTU.edu.tw
[3600] 135.22.113.140.in-addr.arpa. domain name pointer pc230b.Math.NCTU.edu.tw
[3600] 136.22.113.140.in-addr.arpa. domain name pointer mac227a.Math.NCTU.edu.tw
[3600] 137.22.113.140.in-addr.arpa. domain name pointer pc244b.Math.NCTU.edu.tw
[0] 138.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 139.22.113.140.in-addr.arpa. domain name pointer pc230a.Math.NCTU.edu.tw
[3600] 140.22.113.140.in-addr.arpa. domain name pointer pc235a.Math.NCTU.edu.tw
[3600] 141.22.113.140.in-addr.arpa. domain name pointer pc235b.Math.NCTU.edu.tw
[3600] 142.22.113.140.in-addr.arpa. domain name pointer pc237a.Math.NCTU.edu.tw
[3600] 143.22.113.140.in-addr.arpa. domain name pointer pc239a.Math.NCTU.edu.tw
[0] 144.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 145.22.113.140.in-addr.arpa. domain name pointer pc244b.Math.NCTU.edu.tw
[3600] 146.22.113.140.in-addr.arpa. domain name pointer pc242a.Math.NCTU.edu.tw
[3600] 147.22.113.140.in-addr.arpa. domain name pointer pc242b.Math.NCTU.edu.tw
[3600] 148.22.113.140.in-addr.arpa. domain name pointer pc240a.Math.NCTU.edu.tw
[3600] 149.22.113.140.in-addr.arpa. domain name pointer pc246a.Math.NCTU.edu.tw
[3600] 150.22.113.140.in-addr.arpa. domain name pointer pc242a.Math.NCTU.edu.tw
[3600] 151.22.113.140.in-addr.arpa. domain name pointer pc243a.Math.NCTU.edu.tw
[3600] 152.22.113.140.in-addr.arpa. domain name pointer pc244a.Math.NCTU.edu.tw
[3600] 153.22.113.140.in-addr.arpa. domain name pointer pc245a.Math.NCTU.edu.tw
[3600] 154.22.113.140.in-addr.arpa. domain name pointer pc336a.Math.NCTU.edu.tw
[3600] 155.22.113.140.in-addr.arpa. domain name pointer pc240b.Math.NCTU.edu.tw
[3600] 156.22.113.140.in-addr.arpa. domain name pointer calculus.Math.NCTU.edu.tw
[0] 157.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 158.22.113.140.in-addr.arpa. domain name pointer pc342c.Math.NCTU.edu.tw
[3600] 159.22.113.140.in-addr.arpa. domain name pointer pc243b.Math.NCTU.edu.tw
[3600] 160.22.113.140.in-addr.arpa. domain name pointer pc228b.Math.NCTU.edu.tw
[3600] 161.22.113.140.in-addr.arpa. domain name pointer pc228a.Math.NCTU.edu.tw
[3600] 162.22.113.140.in-addr.arpa. domain name pointer pc338a.Math.NCTU.edu.tw
[3600] 163.22.113.140.in-addr.arpa. domain name pointer pc388b.Math.NCTU.edu.tw
[3600] 164.22.113.140.in-addr.arpa. domain name pointer mclai.Math.NCTU.edu.tw
[3600] 165.22.113.140.in-addr.arpa. domain name pointer poisson.Math.NCTU.edu.tw
[3600] 166.22.113.140.in-addr.arpa. domain name pointer emath.Math.NCTU.edu.tw
[3600] 167.22.113.140.in-addr.arpa. domain name pointer pc337b.Math.NCTU.edu.tw
[0] 168.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 169.22.113.140.in-addr.arpa. domain name pointer hp6400.Math.NCTU.edu.tw
[3600] 170.22.113.140.in-addr.arpa. domain name pointer pc341b.Math.NCTU.edu.tw
[3600] 171.22.113.140.in-addr.arpa. domain name pointer pc350a.Math.NCTU.edu.tw
[3600] 172.22.113.140.in-addr.arpa. domain name pointer pc340a.Math.NCTU.edu.tw
[3600] 173.22.113.140.in-addr.arpa. domain name pointer pc341a.Math.NCTU.edu.tw
[3600] 174.22.113.140.in-addr.arpa. domain name pointer pc346a.Math.NCTU.edu.tw
[3600] 175.22.113.140.in-addr.arpa. domain name pointer pc343a.Math.NCTU.edu.tw
[3600] 176.22.113.140.in-addr.arpa. domain name pointer pc342a.Math.NCTU.edu.tw
[3600] 177.22.113.140.in-addr.arpa. domain name pointer mshiue.Math.NCTU.edu.tw
[3600] 178.22.113.140.in-addr.arpa. domain name pointer pc339a.Math.NCTU.edu.tw
[3600] 179.22.113.140.in-addr.arpa. domain name pointer hp326.Math.NCTU.edu.tw
[0] 180.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 181.22.113.140.in-addr.arpa. domain name pointer pc181.Math.NCTU.edu.tw
[3600] 182.22.113.140.in-addr.arpa. domain name pointer pc182.Math.NCTU.edu.tw
[3600] 183.22.113.140.in-addr.arpa. domain name pointer pc183.Math.NCTU.edu.tw
[3600] 184.22.113.140.in-addr.arpa. domain name pointer pc184.Math.NCTU.edu.tw
[3600] 185.22.113.140.in-addr.arpa. domain name pointer pc185.Math.NCTU.edu.tw
[3600] 186.22.113.140.in-addr.arpa. domain name pointer pc186.Math.NCTU.edu.tw
[3600] 187.22.113.140.in-addr.arpa. domain name pointer pc187.Math.NCTU.edu.tw
[3600] 188.22.113.140.in-addr.arpa. domain name pointer pc188.Math.NCTU.edu.tw
[3600] 189.22.113.140.in-addr.arpa. domain name pointer pc189.Math.NCTU.edu.tw
[3600] 190.22.113.140.in-addr.arpa. domain name pointer pc190.Math.NCTU.edu.tw
[3600] 191.22.113.140.in-addr.arpa. domain name pointer pc191.Math.NCTU.edu.tw
[3600] 192.22.113.140.in-addr.arpa. domain name pointer pc192.Math.NCTU.edu.tw
[3600] 193.22.113.140.in-addr.arpa. domain name pointer pc193.Math.NCTU.edu.tw
[3600] 194.22.113.140.in-addr.arpa. domain name pointer pc194.Math.NCTU.edu.tw
[3600] 195.22.113.140.in-addr.arpa. domain name pointer pc195.Math.NCTU.edu.tw
[3600] 196.22.113.140.in-addr.arpa. domain name pointer pc196.Math.NCTU.edu.tw
[3600] 197.22.113.140.in-addr.arpa. domain name pointer pc197.Math.NCTU.edu.tw
[3600] 198.22.113.140.in-addr.arpa. domain name pointer pc198.Math.NCTU.edu.tw
[3600] 199.22.113.140.in-addr.arpa. domain name pointer pc199.Math.NCTU.edu.tw
[3600] 200.22.113.140.in-addr.arpa. domain name pointer pc200.Math.NCTU.edu.tw
[3600] 201.22.113.140.in-addr.arpa. domain name pointer pc201.Math.NCTU.edu.tw
[3600] 202.22.113.140.in-addr.arpa. domain name pointer pc202.Math.NCTU.edu.tw
[3600] 203.22.113.140.in-addr.arpa. domain name pointer pc203.Math.NCTU.edu.tw
[3600] 204.22.113.140.in-addr.arpa. domain name pointer pc204.Math.NCTU.edu.tw
[3600] 205.22.113.140.in-addr.arpa. domain name pointer pc205.Math.NCTU.edu.tw
[3600] 206.22.113.140.in-addr.arpa. domain name pointer pc206.Math.NCTU.edu.tw
[3600] 207.22.113.140.in-addr.arpa. domain name pointer pc207.Math.NCTU.edu.tw
[3600] 208.22.113.140.in-addr.arpa. domain name pointer pc208.Math.NCTU.edu.tw
[3600] 209.22.113.140.in-addr.arpa. domain name pointer pc209.Math.NCTU.edu.tw
[3600] 210.22.113.140.in-addr.arpa. domain name pointer pc210.Math.NCTU.edu.tw
[3600] 211.22.113.140.in-addr.arpa. domain name pointer pc211.Math.NCTU.edu.tw
[3600] 212.22.113.140.in-addr.arpa. domain name pointer pc212.Math.NCTU.edu.tw
[3600] 213.22.113.140.in-addr.arpa. domain name pointer pc213.Math.NCTU.edu.tw
[3600] 214.22.113.140.in-addr.arpa. domain name pointer pc214.Math.NCTU.edu.tw
[3600] 215.22.113.140.in-addr.arpa. domain name pointer pc215.Math.NCTU.edu.tw
[3600] 216.22.113.140.in-addr.arpa. domain name pointer pc216.Math.NCTU.edu.tw
[3600] 217.22.113.140.in-addr.arpa. domain name pointer pc217.Math.NCTU.edu.tw
[3600] 218.22.113.140.in-addr.arpa. domain name pointer pc218.Math.NCTU.edu.tw
[3600] 219.22.113.140.in-addr.arpa. domain name pointer pc219.Math.NCTU.edu.tw
[3600] 220.22.113.140.in-addr.arpa. domain name pointer pc220.Math.NCTU.edu.tw
[3600] 221.22.113.140.in-addr.arpa. domain name pointer pc221.Math.NCTU.edu.tw
[3600] 222.22.113.140.in-addr.arpa. domain name pointer pc222.Math.NCTU.edu.tw
[3600] 223.22.113.140.in-addr.arpa. domain name pointer pc223.Math.NCTU.edu.tw
[3600] 224.22.113.140.in-addr.arpa. domain name pointer pc224.Math.NCTU.edu.tw
[3600] 225.22.113.140.in-addr.arpa. domain name pointer pc225.Math.NCTU.edu.tw
[3600] 226.22.113.140.in-addr.arpa. domain name pointer pc226.Math.NCTU.edu.tw
[3600] 227.22.113.140.in-addr.arpa. domain name pointer pc227.Math.NCTU.edu.tw
[3600] 228.22.113.140.in-addr.arpa. domain name pointer pc228.Math.NCTU.edu.tw
[3600] 229.22.113.140.in-addr.arpa. domain name pointer pc229.Math.NCTU.edu.tw
[3600] 230.22.113.140.in-addr.arpa. domain name pointer pc230.Math.NCTU.edu.tw
[0] 231.22.113.140.in-addr.arpa.: domain name does not exist
[0] 232.22.113.140.in-addr.arpa.: domain name does not exist
[0] 233.22.113.140.in-addr.arpa.: domain name does not exist
[0] 234.22.113.140.in-addr.arpa.: domain name does not exist
[0] 235.22.113.140.in-addr.arpa.: domain name does not exist
[0] 236.22.113.140.in-addr.arpa.: domain name does not exist
[0] 237.22.113.140.in-addr.arpa.: domain name does not exist
[0] 238.22.113.140.in-addr.arpa.: domain name does not exist
[0] 239.22.113.140.in-addr.arpa.: domain name does not exist
[0] 240.22.113.140.in-addr.arpa.: domain name does not exist
[0] 241.22.113.140.in-addr.arpa.: domain name does not exist
[0] 242.22.113.140.in-addr.arpa.: domain name does not exist
[0] 243.22.113.140.in-addr.arpa.: domain name does not exist
[0] 244.22.113.140.in-addr.arpa.: domain name does not exist
[0] 245.22.113.140.in-addr.arpa.: domain name does not exist
[0] 246.22.113.140.in-addr.arpa.: domain name does not exist
[0] 247.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 248.22.113.140.in-addr.arpa. domain name pointer vc6.Math.NCTU.edu.tw
[0] 249.22.113.140.in-addr.arpa.: domain name does not exist
[0] 250.22.113.140.in-addr.arpa.: domain name does not exist
[0] 251.22.113.140.in-addr.arpa.: domain name does not exist
[3600] 252.22.113.140.in-addr.arpa. domain name pointer switch2f.Math.NCTU.edu.tw
[3600] 253.22.113.140.in-addr.arpa. domain name pointer switch3f.Math.NCTU.edu.tw
[3600] 254.22.113.140.in-addr.arpa. domain name pointer router-22.Math.NCTU.edu.tw
[0] 255.22.113.140.in-addr.arpa.: domain name does not exist