[0] 0.4.6.101.in-addr.arpa.: domain name does not exist
[0] 1.4.6.101.in-addr.arpa.: domain name does not exist
[0] 2.4.6.101.in-addr.arpa.: domain name does not exist
[0] 3.4.6.101.in-addr.arpa.: domain name does not exist
[0] 4.4.6.101.in-addr.arpa.: domain name does not exist
[0] 5.4.6.101.in-addr.arpa.: domain name does not exist
[0] 6.4.6.101.in-addr.arpa.: domain name does not exist
[0] 7.4.6.101.in-addr.arpa.: domain name does not exist
[86400] 8.4.6.101.in-addr.arpa. domain name pointer sea.net.edu.cn moon.bjnet.edu.cn mail.tsinghua.edu.cn cernet.edu.cn
[86400] 9.4.6.101.in-addr.arpa. domain name pointer mails.tsinghua.edu.cn
[0] 10.4.6.101.in-addr.arpa.: domain name does not exist
[0] 11.4.6.101.in-addr.arpa.: domain name does not exist
[0] 12.4.6.101.in-addr.arpa.: domain name does not exist
[0] 13.4.6.101.in-addr.arpa.: domain name does not exist
[0] 14.4.6.101.in-addr.arpa.: domain name does not exist
[0] 15.4.6.101.in-addr.arpa.: domain name does not exist
[0] 16.4.6.101.in-addr.arpa.: domain name does not exist
[0] 17.4.6.101.in-addr.arpa.: domain name does not exist
[0] 18.4.6.101.in-addr.arpa.: domain name does not exist
[0] 19.4.6.101.in-addr.arpa.: domain name does not exist
[0] 20.4.6.101.in-addr.arpa.: domain name does not exist
[0] 21.4.6.101.in-addr.arpa.: domain name does not exist
[0] 22.4.6.101.in-addr.arpa.: domain name does not exist
[0] 23.4.6.101.in-addr.arpa.: domain name does not exist
[0] 24.4.6.101.in-addr.arpa.: domain name does not exist
[86400] 25.4.6.101.in-addr.arpa. domain name pointer smtp01.tsinghua.edu.cn
[86400] 26.4.6.101.in-addr.arpa. domain name pointer smtp02.tsinghua.edu.cn
[86400] 27.4.6.101.in-addr.arpa. domain name pointer smtp03.tsinghua.edu.cn
[86400] 28.4.6.101.in-addr.arpa. domain name pointer smtp04.tsinghua.edu.cn
[86400] 29.4.6.101.in-addr.arpa. domain name pointer smtp05.tsinghua.edu.cn
[86400] 30.4.6.101.in-addr.arpa. domain name pointer smtp06.tsinghua.edu.cn
[86400] 31.4.6.101.in-addr.arpa. domain name pointer smtp07.tsinghua.edu.cn
[86400] 32.4.6.101.in-addr.arpa. domain name pointer smtp08.tsinghua.edu.cn
[86400] 33.4.6.101.in-addr.arpa. domain name pointer smtp09.tsinghua.edu.cn
[86400] 34.4.6.101.in-addr.arpa. domain name pointer smtp10.tsinghua.edu.cn
[86400] 35.4.6.101.in-addr.arpa. domain name pointer smtp11.tsinghua.edu.cn
[86400] 36.4.6.101.in-addr.arpa. domain name pointer smtp12.tsinghua.edu.cn
[86400] 37.4.6.101.in-addr.arpa. domain name pointer smtp13.tsinghua.edu.cn
[86400] 38.4.6.101.in-addr.arpa. domain name pointer smtp14.tsinghua.edu.cn
[86400] 39.4.6.101.in-addr.arpa. domain name pointer smtp15.tsinghua.edu.cn
[86400] 40.4.6.101.in-addr.arpa. domain name pointer smtp16.tsinghua.edu.cn
[86400] 41.4.6.101.in-addr.arpa. domain name pointer smtp17.tsinghua.edu.cn
[86400] 42.4.6.101.in-addr.arpa. domain name pointer smtp18.tsinghua.edu.cn
[86400] 43.4.6.101.in-addr.arpa. domain name pointer smtp19.tsinghua.edu.cn
[86400] 44.4.6.101.in-addr.arpa. domain name pointer smtp20.tsinghua.edu.cn
[86400] 45.4.6.101.in-addr.arpa. domain name pointer smtp21.tsinghua.edu.cn
[86400] 46.4.6.101.in-addr.arpa. domain name pointer smtp22.tsinghua.edu.cn
[86400] 47.4.6.101.in-addr.arpa. domain name pointer smtp23.tsinghua.edu.cn
[86400] 48.4.6.101.in-addr.arpa. domain name pointer smtp24.tsinghua.edu.cn
[86400] 49.4.6.101.in-addr.arpa. domain name pointer smtp25.tsinghua.edu.cn
[86400] 50.4.6.101.in-addr.arpa. domain name pointer smtp26.tsinghua.edu.cn
[86400] 51.4.6.101.in-addr.arpa. domain name pointer smtp27.tsinghua.edu.cn
[86400] 52.4.6.101.in-addr.arpa. domain name pointer smtp28.tsinghua.edu.cn
[86400] 53.4.6.101.in-addr.arpa. domain name pointer smtp29.tsinghua.edu.cn
[86400] 54.4.6.101.in-addr.arpa. domain name pointer smtp30.tsinghua.edu.cn
[86400] 55.4.6.101.in-addr.arpa. domain name pointer smtp31.tsinghua.edu.cn
[86400] 56.4.6.101.in-addr.arpa. domain name pointer smtp32.tsinghua.edu.cn
[86400] 57.4.6.101.in-addr.arpa. domain name pointer smtp33.tsinghua.edu.cn
[86400] 58.4.6.101.in-addr.arpa. domain name pointer smtp34.tsinghua.edu.cn
[86400] 59.4.6.101.in-addr.arpa. domain name pointer smtp35.tsinghua.edu.cn
[86400] 60.4.6.101.in-addr.arpa. domain name pointer smtp36.tsinghua.edu.cn
[86400] 61.4.6.101.in-addr.arpa. domain name pointer smtp37.tsinghua.edu.cn
[86400] 62.4.6.101.in-addr.arpa. domain name pointer smtp38.tsinghua.edu.cn
[86400] 63.4.6.101.in-addr.arpa. domain name pointer smtp39.tsinghua.edu.cn
[86400] 64.4.6.101.in-addr.arpa. domain name pointer smtp40.tsinghua.edu.cn
[86400] 65.4.6.101.in-addr.arpa. domain name pointer smtp41.tsinghua.edu.cn
[86400] 66.4.6.101.in-addr.arpa. domain name pointer smtp42.tsinghua.edu.cn
[86400] 67.4.6.101.in-addr.arpa. domain name pointer smtp43.tsinghua.edu.cn
[86400] 68.4.6.101.in-addr.arpa. domain name pointer smtp44.tsinghua.edu.cn
[86400] 69.4.6.101.in-addr.arpa. domain name pointer smtp45.tsinghua.edu.cn
[86400] 70.4.6.101.in-addr.arpa. domain name pointer smtp46.tsinghua.edu.cn
[86400] 71.4.6.101.in-addr.arpa. domain name pointer smtp47.tsinghua.edu.cn
[86400] 72.4.6.101.in-addr.arpa. domain name pointer smtp48.tsinghua.edu.cn
[86400] 73.4.6.101.in-addr.arpa. domain name pointer smtp49.tsinghua.edu.cn
[86400] 74.4.6.101.in-addr.arpa. domain name pointer smtp50.tsinghua.edu.cn
[86400] 75.4.6.101.in-addr.arpa. domain name pointer smtp51.tsinghua.edu.cn
[86400] 76.4.6.101.in-addr.arpa. domain name pointer smtp52.tsinghua.edu.cn
[86400] 77.4.6.101.in-addr.arpa. domain name pointer smtp53.tsinghua.edu.cn
[86400] 78.4.6.101.in-addr.arpa. domain name pointer smtp54.tsinghua.edu.cn
[86400] 79.4.6.101.in-addr.arpa. domain name pointer smtp55.tsinghua.edu.cn
[86400] 80.4.6.101.in-addr.arpa. domain name pointer smtp56.tsinghua.edu.cn
[86400] 81.4.6.101.in-addr.arpa. domain name pointer smtp57.tsinghua.edu.cn
[86400] 82.4.6.101.in-addr.arpa. domain name pointer smtp58.tsinghua.edu.cn
[86400] 83.4.6.101.in-addr.arpa. domain name pointer smtp59.tsinghua.edu.cn
[86400] 84.4.6.101.in-addr.arpa. domain name pointer smtp60.tsinghua.edu.cn
[86400] 85.4.6.101.in-addr.arpa. domain name pointer smtp61.tsinghua.edu.cn
[86400] 86.4.6.101.in-addr.arpa. domain name pointer smtp62.tsinghua.edu.cn
[86400] 87.4.6.101.in-addr.arpa. domain name pointer smtp63.tsinghua.edu.cn
[86400] 88.4.6.101.in-addr.arpa. domain name pointer smtp64.tsinghua.edu.cn
[86400] 89.4.6.101.in-addr.arpa. domain name pointer smtp65.tsinghua.edu.cn
[86400] 90.4.6.101.in-addr.arpa. domain name pointer smtp66.tsinghua.edu.cn
[86400] 91.4.6.101.in-addr.arpa. domain name pointer smtp67.tsinghua.edu.cn
[86400] 92.4.6.101.in-addr.arpa. domain name pointer smtp68.tsinghua.edu.cn
[86400] 93.4.6.101.in-addr.arpa. domain name pointer smtp69.tsinghua.edu.cn
[86400] 94.4.6.101.in-addr.arpa. domain name pointer smtp70.tsinghua.edu.cn
[86400] 95.4.6.101.in-addr.arpa. domain name pointer smtp71.tsinghua.edu.cn
[86400] 96.4.6.101.in-addr.arpa. domain name pointer smtp72.tsinghua.edu.cn
[86400] 97.4.6.101.in-addr.arpa. domain name pointer smtp73.tsinghua.edu.cn
[86400] 98.4.6.101.in-addr.arpa. domain name pointer smtp74.tsinghua.edu.cn
[86400] 99.4.6.101.in-addr.arpa. domain name pointer smtp75.tsinghua.edu.cn
[86400] 100.4.6.101.in-addr.arpa. domain name pointer smtp76.tsinghua.edu.cn
[86400] 101.4.6.101.in-addr.arpa. domain name pointer smtp77.tsinghua.edu.cn
[86400] 102.4.6.101.in-addr.arpa. domain name pointer smtp78.tsinghua.edu.cn
[86400] 103.4.6.101.in-addr.arpa. domain name pointer smtp79.tsinghua.edu.cn
[86400] 104.4.6.101.in-addr.arpa. domain name pointer smtp80.tsinghua.edu.cn
[86400] 105.4.6.101.in-addr.arpa. domain name pointer smtp81.tsinghua.edu.cn
[86400] 106.4.6.101.in-addr.arpa. domain name pointer smtp82.tsinghua.edu.cn
[86400] 107.4.6.101.in-addr.arpa. domain name pointer smtp83.tsinghua.edu.cn
[86400] 108.4.6.101.in-addr.arpa. domain name pointer smtp84.tsinghua.edu.cn
[86400] 109.4.6.101.in-addr.arpa. domain name pointer smtp85.tsinghua.edu.cn
[86400] 110.4.6.101.in-addr.arpa. domain name pointer smtp86.tsinghua.edu.cn
[86400] 111.4.6.101.in-addr.arpa. domain name pointer smtp87.tsinghua.edu.cn
[86400] 112.4.6.101.in-addr.arpa. domain name pointer smtp88.tsinghua.edu.cn
[86400] 113.4.6.101.in-addr.arpa. domain name pointer smtp89.tsinghua.edu.cn
[86400] 114.4.6.101.in-addr.arpa. domain name pointer smtp90.tsinghua.edu.cn
[86400] 115.4.6.101.in-addr.arpa. domain name pointer smtp91.tsinghua.edu.cn
[86400] 116.4.6.101.in-addr.arpa. domain name pointer smtp92.tsinghua.edu.cn
[86400] 117.4.6.101.in-addr.arpa. domain name pointer smtp93.tsinghua.edu.cn
[86400] 118.4.6.101.in-addr.arpa. domain name pointer smtp94.tsinghua.edu.cn
[86400] 119.4.6.101.in-addr.arpa. domain name pointer smtp95.tsinghua.edu.cn
[86400] 120.4.6.101.in-addr.arpa. domain name pointer smtp96.tsinghua.edu.cn
[86400] 121.4.6.101.in-addr.arpa. domain name pointer smtp97.tsinghua.edu.cn
[86400] 122.4.6.101.in-addr.arpa. domain name pointer smtp98.tsinghua.edu.cn
[86400] 123.4.6.101.in-addr.arpa. domain name pointer smtp99.tsinghua.edu.cn
[86400] 124.4.6.101.in-addr.arpa. domain name pointer smtp100.tsinghua.edu.cn
[86400] 125.4.6.101.in-addr.arpa. domain name pointer smtp101.tsinghua.edu.cn
[86400] 126.4.6.101.in-addr.arpa. domain name pointer smtp102.tsinghua.edu.cn
[86400] 127.4.6.101.in-addr.arpa. domain name pointer smtp103.tsinghua.edu.cn
[86400] 128.4.6.101.in-addr.arpa. domain name pointer smtp104.tsinghua.edu.cn
[86400] 129.4.6.101.in-addr.arpa. domain name pointer smtp105.tsinghua.edu.cn
[86400] 130.4.6.101.in-addr.arpa. domain name pointer smtp106.tsinghua.edu.cn
[86400] 131.4.6.101.in-addr.arpa. domain name pointer smtp107.tsinghua.edu.cn
[86400] 132.4.6.101.in-addr.arpa. domain name pointer smtp108.tsinghua.edu.cn
[86400] 133.4.6.101.in-addr.arpa. domain name pointer smtp109.tsinghua.edu.cn
[86400] 134.4.6.101.in-addr.arpa. domain name pointer smtp110.tsinghua.edu.cn
[86400] 135.4.6.101.in-addr.arpa. domain name pointer smtp111.tsinghua.edu.cn
[86400] 136.4.6.101.in-addr.arpa. domain name pointer smtp112.tsinghua.edu.cn
[86400] 137.4.6.101.in-addr.arpa. domain name pointer smtp113.tsinghua.edu.cn
[86400] 138.4.6.101.in-addr.arpa. domain name pointer smtp114.tsinghua.edu.cn
[86400] 139.4.6.101.in-addr.arpa. domain name pointer smtp115.tsinghua.edu.cn
[86400] 140.4.6.101.in-addr.arpa. domain name pointer smtp116.tsinghua.edu.cn
[86400] 141.4.6.101.in-addr.arpa. domain name pointer smtp117.tsinghua.edu.cn
[86400] 142.4.6.101.in-addr.arpa. domain name pointer smtp118.tsinghua.edu.cn
[86400] 143.4.6.101.in-addr.arpa. domain name pointer smtp119.tsinghua.edu.cn
[86400] 144.4.6.101.in-addr.arpa. domain name pointer smtp120.tsinghua.edu.cn
[86400] 145.4.6.101.in-addr.arpa. domain name pointer smtp121.tsinghua.edu.cn
[86400] 146.4.6.101.in-addr.arpa. domain name pointer smtp122.tsinghua.edu.cn
[86400] 147.4.6.101.in-addr.arpa. domain name pointer smtp123.tsinghua.edu.cn
[86400] 148.4.6.101.in-addr.arpa. domain name pointer smtp124.tsinghua.edu.cn
[86400] 149.4.6.101.in-addr.arpa. domain name pointer smtp125.tsinghua.edu.cn
[86400] 150.4.6.101.in-addr.arpa. domain name pointer smtp126.tsinghua.edu.cn
[86400] 151.4.6.101.in-addr.arpa. domain name pointer smtp127.tsinghua.edu.cn
[86400] 152.4.6.101.in-addr.arpa. domain name pointer smtp128.tsinghua.edu.cn
[86400] 153.4.6.101.in-addr.arpa. domain name pointer smtp129.tsinghua.edu.cn
[86400] 154.4.6.101.in-addr.arpa. domain name pointer smtp130.tsinghua.edu.cn
[86400] 155.4.6.101.in-addr.arpa. domain name pointer smtp131.tsinghua.edu.cn
[86400] 156.4.6.101.in-addr.arpa. domain name pointer smtp132.tsinghua.edu.cn
[86400] 157.4.6.101.in-addr.arpa. domain name pointer smtp133.tsinghua.edu.cn
[86400] 158.4.6.101.in-addr.arpa. domain name pointer smtp134.tsinghua.edu.cn
[86400] 159.4.6.101.in-addr.arpa. domain name pointer smtp135.tsinghua.edu.cn
[86400] 160.4.6.101.in-addr.arpa. domain name pointer smtp136.tsinghua.edu.cn
[86400] 161.4.6.101.in-addr.arpa. domain name pointer smtp137.tsinghua.edu.cn
[86400] 162.4.6.101.in-addr.arpa. domain name pointer smtp138.tsinghua.edu.cn
[86400] 163.4.6.101.in-addr.arpa. domain name pointer smtp139.tsinghua.edu.cn
[86400] 164.4.6.101.in-addr.arpa. domain name pointer smtp140.tsinghua.edu.cn
[86400] 165.4.6.101.in-addr.arpa. domain name pointer smtp141.tsinghua.edu.cn
[86400] 166.4.6.101.in-addr.arpa. domain name pointer smtp142.tsinghua.edu.cn
[86400] 167.4.6.101.in-addr.arpa. domain name pointer smtp143.tsinghua.edu.cn
[86400] 168.4.6.101.in-addr.arpa. domain name pointer smtp144.tsinghua.edu.cn
[86400] 169.4.6.101.in-addr.arpa. domain name pointer smtp145.tsinghua.edu.cn
[86400] 170.4.6.101.in-addr.arpa. domain name pointer smtp146.tsinghua.edu.cn
[86400] 171.4.6.101.in-addr.arpa. domain name pointer smtp147.tsinghua.edu.cn
[86400] 172.4.6.101.in-addr.arpa. domain name pointer smtp148.tsinghua.edu.cn
[86400] 173.4.6.101.in-addr.arpa. domain name pointer smtp149.tsinghua.edu.cn
[86400] 174.4.6.101.in-addr.arpa. domain name pointer smtp150.tsinghua.edu.cn
[86400] 175.4.6.101.in-addr.arpa. domain name pointer smtp151.tsinghua.edu.cn
[86400] 176.4.6.101.in-addr.arpa. domain name pointer smtp152.tsinghua.edu.cn
[86400] 177.4.6.101.in-addr.arpa. domain name pointer smtp153.tsinghua.edu.cn
[86400] 178.4.6.101.in-addr.arpa. domain name pointer smtp154.tsinghua.edu.cn
[86400] 179.4.6.101.in-addr.arpa. domain name pointer smtp155.tsinghua.edu.cn
[86400] 180.4.6.101.in-addr.arpa. domain name pointer smtp156.tsinghua.edu.cn
[86400] 181.4.6.101.in-addr.arpa. domain name pointer smtp157.tsinghua.edu.cn
[86400] 182.4.6.101.in-addr.arpa. domain name pointer smtp158.tsinghua.edu.cn
[86400] 183.4.6.101.in-addr.arpa. domain name pointer smtp159.tsinghua.edu.cn
[86400] 184.4.6.101.in-addr.arpa. domain name pointer smtp160.tsinghua.edu.cn
[86400] 185.4.6.101.in-addr.arpa. domain name pointer smtp161.tsinghua.edu.cn
[86400] 186.4.6.101.in-addr.arpa. domain name pointer smtp162.tsinghua.edu.cn
[86400] 187.4.6.101.in-addr.arpa. domain name pointer smtp163.tsinghua.edu.cn
[86400] 188.4.6.101.in-addr.arpa. domain name pointer smtp164.tsinghua.edu.cn
[86400] 189.4.6.101.in-addr.arpa. domain name pointer smtp165.tsinghua.edu.cn
[86400] 190.4.6.101.in-addr.arpa. domain name pointer smtp166.tsinghua.edu.cn
[86400] 191.4.6.101.in-addr.arpa. domain name pointer smtp167.tsinghua.edu.cn
[86400] 192.4.6.101.in-addr.arpa. domain name pointer smtp168.tsinghua.edu.cn
[86400] 193.4.6.101.in-addr.arpa. domain name pointer smtp169.tsinghua.edu.cn
[86400] 194.4.6.101.in-addr.arpa. domain name pointer smtp170.tsinghua.edu.cn
[86400] 195.4.6.101.in-addr.arpa. domain name pointer smtp171.tsinghua.edu.cn
[86400] 196.4.6.101.in-addr.arpa. domain name pointer smtp172.tsinghua.edu.cn
[86400] 197.4.6.101.in-addr.arpa. domain name pointer smtp173.tsinghua.edu.cn
[86400] 198.4.6.101.in-addr.arpa. domain name pointer smtp174.tsinghua.edu.cn
[86400] 199.4.6.101.in-addr.arpa. domain name pointer smtp175.tsinghua.edu.cn
[86400] 200.4.6.101.in-addr.arpa. domain name pointer smtp176.tsinghua.edu.cn
[86400] 201.4.6.101.in-addr.arpa. domain name pointer smtp177.tsinghua.edu.cn
[86400] 202.4.6.101.in-addr.arpa. domain name pointer smtp178.tsinghua.edu.cn
[86400] 203.4.6.101.in-addr.arpa. domain name pointer smtp179.tsinghua.edu.cn
[86400] 204.4.6.101.in-addr.arpa. domain name pointer smtp180.tsinghua.edu.cn
[86400] 205.4.6.101.in-addr.arpa. domain name pointer smtp181.tsinghua.edu.cn
[86400] 206.4.6.101.in-addr.arpa. domain name pointer smtp182.tsinghua.edu.cn
[86400] 207.4.6.101.in-addr.arpa. domain name pointer smtp183.tsinghua.edu.cn
[86400] 208.4.6.101.in-addr.arpa. domain name pointer smtp184.tsinghua.edu.cn
[86400] 209.4.6.101.in-addr.arpa. domain name pointer smtp185.tsinghua.edu.cn
[86400] 210.4.6.101.in-addr.arpa. domain name pointer smtp186.tsinghua.edu.cn
[86400] 211.4.6.101.in-addr.arpa. domain name pointer smtp187.tsinghua.edu.cn
[86400] 212.4.6.101.in-addr.arpa. domain name pointer smtp188.tsinghua.edu.cn
[86400] 213.4.6.101.in-addr.arpa. domain name pointer smtp189.tsinghua.edu.cn
[86400] 214.4.6.101.in-addr.arpa. domain name pointer smtp190.tsinghua.edu.cn
[86400] 215.4.6.101.in-addr.arpa. domain name pointer smtp191.tsinghua.edu.cn
[86400] 216.4.6.101.in-addr.arpa. domain name pointer smtp192.tsinghua.edu.cn
[86400] 217.4.6.101.in-addr.arpa. domain name pointer smtp193.tsinghua.edu.cn
[86400] 218.4.6.101.in-addr.arpa. domain name pointer smtp194.tsinghua.edu.cn
[86400] 219.4.6.101.in-addr.arpa. domain name pointer smtp195.tsinghua.edu.cn
[86400] 220.4.6.101.in-addr.arpa. domain name pointer smtp196.tsinghua.edu.cn
[86400] 221.4.6.101.in-addr.arpa. domain name pointer smtp197.tsinghua.edu.cn
[86400] 222.4.6.101.in-addr.arpa. domain name pointer smtp198.tsinghua.edu.cn
[86400] 223.4.6.101.in-addr.arpa. domain name pointer smtp199.tsinghua.edu.cn
[86400] 224.4.6.101.in-addr.arpa. domain name pointer smtp200.tsinghua.edu.cn
[86400] 225.4.6.101.in-addr.arpa. domain name pointer smtp201.tsinghua.edu.cn
[86400] 226.4.6.101.in-addr.arpa. domain name pointer smtp202.tsinghua.edu.cn
[86400] 227.4.6.101.in-addr.arpa. domain name pointer smtp203.tsinghua.edu.cn
[86400] 228.4.6.101.in-addr.arpa. domain name pointer smtp204.tsinghua.edu.cn
[86400] 229.4.6.101.in-addr.arpa. domain name pointer smtp205.tsinghua.edu.cn
[86400] 230.4.6.101.in-addr.arpa. domain name pointer smtp206.tsinghua.edu.cn
[86400] 231.4.6.101.in-addr.arpa. domain name pointer smtp207.tsinghua.edu.cn
[86400] 232.4.6.101.in-addr.arpa. domain name pointer smtp208.tsinghua.edu.cn
[86400] 233.4.6.101.in-addr.arpa. domain name pointer smtp209.tsinghua.edu.cn
[86400] 234.4.6.101.in-addr.arpa. domain name pointer smtp210.tsinghua.edu.cn
[86400] 235.4.6.101.in-addr.arpa. domain name pointer smtp211.tsinghua.edu.cn
[86400] 236.4.6.101.in-addr.arpa. domain name pointer smtp212.tsinghua.edu.cn
[86400] 237.4.6.101.in-addr.arpa. domain name pointer smtp213.tsinghua.edu.cn
[86400] 238.4.6.101.in-addr.arpa. domain name pointer smtp214.tsinghua.edu.cn
[86400] 239.4.6.101.in-addr.arpa. domain name pointer smtp215.tsinghua.edu.cn
[86400] 240.4.6.101.in-addr.arpa. domain name pointer smtp216.tsinghua.edu.cn
[86400] 241.4.6.101.in-addr.arpa. domain name pointer smtp217.tsinghua.edu.cn
[86400] 242.4.6.101.in-addr.arpa. domain name pointer smtp218.tsinghua.edu.cn
[86400] 243.4.6.101.in-addr.arpa. domain name pointer smtp219.tsinghua.edu.cn
[86400] 244.4.6.101.in-addr.arpa. domain name pointer smtp220.tsinghua.edu.cn
[86400] 245.4.6.101.in-addr.arpa. domain name pointer smtp221.tsinghua.edu.cn
[86400] 246.4.6.101.in-addr.arpa. domain name pointer smtp222.tsinghua.edu.cn
[86400] 247.4.6.101.in-addr.arpa. domain name pointer smtp223.tsinghua.edu.cn
[86400] 248.4.6.101.in-addr.arpa. domain name pointer smtp224.tsinghua.edu.cn
[86400] 249.4.6.101.in-addr.arpa. domain name pointer smtp225.tsinghua.edu.cn
[86400] 250.4.6.101.in-addr.arpa. domain name pointer smtp226.tsinghua.edu.cn
[86400] 251.4.6.101.in-addr.arpa. domain name pointer smtp227.tsinghua.edu.cn
[86400] 252.4.6.101.in-addr.arpa. domain name pointer smtp228.tsinghua.edu.cn
[86400] 253.4.6.101.in-addr.arpa. domain name pointer smtp229.tsinghua.edu.cn
[86400] 254.4.6.101.in-addr.arpa. domain name pointer smtp230.tsinghua.edu.cn
[0] 255.4.6.101.in-addr.arpa.: domain name does not exist