[0] 0.49.189.137.in-addr.arpa.: domain name does not exist
[86400] 1.49.189.137.in-addr.arpa. domain name pointer euler.math.cuhk.edu.hk
[86400] 2.49.189.137.in-addr.arpa. domain name pointer euclid.math.cuhk.edu.hk
[86400] 3.49.189.137.in-addr.arpa. domain name pointer webmail.math.cuhk.edu.hk
[86400] 4.49.189.137.in-addr.arpa. domain name pointer sshgate.math.cuhk.edu.hk
[86400] 5.49.189.137.in-addr.arpa. domain name pointer intranet.math.cuhk.edu.hk
[86400] 6.49.189.137.in-addr.arpa. domain name pointer laplace.math.cuhk.edu.hk
[86400] 7.49.189.137.in-addr.arpa. domain name pointer hopf.math.cuhk.edu.hk
[86400] 8.49.189.137.in-addr.arpa. domain name pointer license.math.cuhk.edu.hk
[86400] 9.49.189.137.in-addr.arpa. domain name pointer lefschetz.math.cuhk.edu.hk
[86400] 10.49.189.137.in-addr.arpa. domain name pointer epymt.math.cuhk.edu.hk
[86400] 11.49.189.137.in-addr.arpa. domain name pointer hlma.math.cuhk.edu.hk
[86400] 12.49.189.137.in-addr.arpa. domain name pointer webwork.math.cuhk.edu.hk
[86400] 13.49.189.137.in-addr.arpa. domain name pointer lab13.math.cuhk.edu.hk
[86400] 14.49.189.137.in-addr.arpa. domain name pointer lab14.math.cuhk.edu.hk
[86400] 15.49.189.137.in-addr.arpa. domain name pointer lab15.math.cuhk.edu.hk
[86400] 16.49.189.137.in-addr.arpa. domain name pointer lab16.math.cuhk.edu.hk
[86400] 17.49.189.137.in-addr.arpa. domain name pointer element.math.cuhk.edu.hk
[86400] 18.49.189.137.in-addr.arpa. domain name pointer measure.math.cuhk.edu.hk
[86400] 19.49.189.137.in-addr.arpa. domain name pointer circle.math.cuhk.edu.hk
[86400] 20.49.189.137.in-addr.arpa. domain name pointer equation.math.cuhk.edu.hk
[86400] 21.49.189.137.in-addr.arpa. domain name pointer matrix.math.cuhk.edu.hk
[86400] 22.49.189.137.in-addr.arpa. domain name pointer integral.math.cuhk.edu.hk
[86400] 23.49.189.137.in-addr.arpa. domain name pointer fractal.math.cuhk.edu.hk
[86400] 24.49.189.137.in-addr.arpa. domain name pointer number.math.cuhk.edu.hk
[86400] 25.49.189.137.in-addr.arpa. domain name pointer clique.math.cuhk.edu.hk
[86400] 26.49.189.137.in-addr.arpa. domain name pointer lab26.math.cuhk.edu.hk
[86400] 27.49.189.137.in-addr.arpa. domain name pointer lab27.math.cuhk.edu.hk
[86400] 28.49.189.137.in-addr.arpa. domain name pointer lab28.math.cuhk.edu.hk
[86400] 29.49.189.137.in-addr.arpa. domain name pointer lab29.math.cuhk.edu.hk
[86400] 30.49.189.137.in-addr.arpa. domain name pointer lab30.math.cuhk.edu.hk
[86400] 31.49.189.137.in-addr.arpa. domain name pointer lab31.math.cuhk.edu.hk
[86400] 32.49.189.137.in-addr.arpa. domain name pointer lab32.math.cuhk.edu.hk
[86400] 33.49.189.137.in-addr.arpa. domain name pointer lab33.math.cuhk.edu.hk
[86400] 34.49.189.137.in-addr.arpa. domain name pointer lab34.math.cuhk.edu.hk
[86400] 35.49.189.137.in-addr.arpa. domain name pointer lab35.math.cuhk.edu.hk
[86400] 36.49.189.137.in-addr.arpa. domain name pointer lab36.math.cuhk.edu.hk
[86400] 37.49.189.137.in-addr.arpa. domain name pointer lab37.math.cuhk.edu.hk
[86400] 38.49.189.137.in-addr.arpa. domain name pointer lab38.math.cuhk.edu.hk
[86400] 39.49.189.137.in-addr.arpa. domain name pointer lab39.math.cuhk.edu.hk
[86400] 40.49.189.137.in-addr.arpa. domain name pointer lab40.math.cuhk.edu.hk
[86400] 41.49.189.137.in-addr.arpa. domain name pointer lab41.math.cuhk.edu.hk
[86400] 42.49.189.137.in-addr.arpa. domain name pointer lab42.math.cuhk.edu.hk
[86400] 43.49.189.137.in-addr.arpa. domain name pointer lab43.math.cuhk.edu.hk
[86400] 44.49.189.137.in-addr.arpa. domain name pointer lab44.math.cuhk.edu.hk
[86400] 45.49.189.137.in-addr.arpa. domain name pointer lab45.math.cuhk.edu.hk
[86400] 46.49.189.137.in-addr.arpa. domain name pointer lab46.math.cuhk.edu.hk
[86400] 47.49.189.137.in-addr.arpa. domain name pointer lab47.math.cuhk.edu.hk
[86400] 48.49.189.137.in-addr.arpa. domain name pointer lab48.math.cuhk.edu.hk
[0] 49.49.189.137.in-addr.arpa.: domain name does not exist
[0] 50.49.189.137.in-addr.arpa.: domain name does not exist
[86400] 51.49.189.137.in-addr.arpa. domain name pointer lab51.math.cuhk.edu.hk
[86400] 52.49.189.137.in-addr.arpa. domain name pointer lab52.math.cuhk.edu.hk
[86400] 53.49.189.137.in-addr.arpa. domain name pointer lab53.math.cuhk.edu.hk
[86400] 54.49.189.137.in-addr.arpa. domain name pointer lab54.math.cuhk.edu.hk
[86400] 55.49.189.137.in-addr.arpa. domain name pointer lab55.math.cuhk.edu.hk
[86400] 56.49.189.137.in-addr.arpa. domain name pointer lab56.math.cuhk.edu.hk
[86400] 57.49.189.137.in-addr.arpa. domain name pointer lab57.math.cuhk.edu.hk
[86400] 58.49.189.137.in-addr.arpa. domain name pointer lab58.math.cuhk.edu.hk
[86400] 59.49.189.137.in-addr.arpa. domain name pointer lab59.math.cuhk.edu.hk
[86400] 60.49.189.137.in-addr.arpa. domain name pointer lab60.math.cuhk.edu.hk
[86400] 61.49.189.137.in-addr.arpa. domain name pointer lab61.math.cuhk.edu.hk
[86400] 62.49.189.137.in-addr.arpa. domain name pointer lab62.math.cuhk.edu.hk
[86400] 63.49.189.137.in-addr.arpa. domain name pointer lab63.math.cuhk.edu.hk
[86400] 64.49.189.137.in-addr.arpa. domain name pointer lab64.math.cuhk.edu.hk
[86400] 65.49.189.137.in-addr.arpa. domain name pointer lab65.math.cuhk.edu.hk
[86400] 66.49.189.137.in-addr.arpa. domain name pointer lab66.math.cuhk.edu.hk
[86400] 67.49.189.137.in-addr.arpa. domain name pointer lab67.math.cuhk.edu.hk
[86400] 68.49.189.137.in-addr.arpa. domain name pointer lab68.math.cuhk.edu.hk
[86400] 69.49.189.137.in-addr.arpa. domain name pointer lab69.math.cuhk.edu.hk
[86400] 70.49.189.137.in-addr.arpa. domain name pointer lab70.math.cuhk.edu.hk
[86400] 71.49.189.137.in-addr.arpa. domain name pointer lab71.math.cuhk.edu.hk
[86400] 72.49.189.137.in-addr.arpa. domain name pointer lab72.math.cuhk.edu.hk
[86400] 73.49.189.137.in-addr.arpa. domain name pointer lab73.math.cuhk.edu.hk
[86400] 74.49.189.137.in-addr.arpa. domain name pointer lab74.math.cuhk.edu.hk
[86400] 75.49.189.137.in-addr.arpa. domain name pointer lab75.math.cuhk.edu.hk
[86400] 76.49.189.137.in-addr.arpa. domain name pointer lab76.math.cuhk.edu.hk
[86400] 77.49.189.137.in-addr.arpa. domain name pointer lab77.math.cuhk.edu.hk
[86400] 78.49.189.137.in-addr.arpa. domain name pointer lab78.math.cuhk.edu.hk
[86400] 79.49.189.137.in-addr.arpa. domain name pointer lab79.math.cuhk.edu.hk
[86400] 80.49.189.137.in-addr.arpa. domain name pointer lab80.math.cuhk.edu.hk
[86400] 81.49.189.137.in-addr.arpa. domain name pointer lab81.math.cuhk.edu.hk
[86400] 82.49.189.137.in-addr.arpa. domain name pointer lab82.math.cuhk.edu.hk
[86400] 83.49.189.137.in-addr.arpa. domain name pointer lab83.math.cuhk.edu.hk
[86400] 84.49.189.137.in-addr.arpa. domain name pointer lab84.math.cuhk.edu.hk
[86400] 85.49.189.137.in-addr.arpa. domain name pointer lab85.math.cuhk.edu.hk
[86400] 86.49.189.137.in-addr.arpa. domain name pointer lab86.math.cuhk.edu.hk
[86400] 87.49.189.137.in-addr.arpa. domain name pointer lab87.math.cuhk.edu.hk
[86400] 88.49.189.137.in-addr.arpa. domain name pointer lab88.math.cuhk.edu.hk
[86400] 89.49.189.137.in-addr.arpa. domain name pointer lab89.math.cuhk.edu.hk
[86400] 90.49.189.137.in-addr.arpa. domain name pointer lab90.math.cuhk.edu.hk
[86400] 91.49.189.137.in-addr.arpa. domain name pointer lab91.math.cuhk.edu.hk
[86400] 92.49.189.137.in-addr.arpa. domain name pointer lab92.math.cuhk.edu.hk
[86400] 93.49.189.137.in-addr.arpa. domain name pointer lab93.math.cuhk.edu.hk
[86400] 94.49.189.137.in-addr.arpa. domain name pointer lab94.math.cuhk.edu.hk
[86400] 95.49.189.137.in-addr.arpa. domain name pointer lab95.math.cuhk.edu.hk
[86400] 96.49.189.137.in-addr.arpa. domain name pointer lab96.math.cuhk.edu.hk
[86400] 97.49.189.137.in-addr.arpa. domain name pointer lab97.math.cuhk.edu.hk
[86400] 98.49.189.137.in-addr.arpa. domain name pointer lab98.math.cuhk.edu.hk
[86400] 99.49.189.137.in-addr.arpa. domain name pointer lab99.math.cuhk.edu.hk
[86400] 100.49.189.137.in-addr.arpa. domain name pointer lab100.math.cuhk.edu.hk
[86400] 101.49.189.137.in-addr.arpa. domain name pointer pma101.math.cuhk.edu.hk
[86400] 102.49.189.137.in-addr.arpa. domain name pointer pma102.math.cuhk.edu.hk
[86400] 103.49.189.137.in-addr.arpa. domain name pointer pma103.math.cuhk.edu.hk
[86400] 104.49.189.137.in-addr.arpa. domain name pointer pma104.math.cuhk.edu.hk
[86400] 105.49.189.137.in-addr.arpa. domain name pointer pma105.math.cuhk.edu.hk
[86400] 106.49.189.137.in-addr.arpa. domain name pointer pma106.math.cuhk.edu.hk
[86400] 107.49.189.137.in-addr.arpa. domain name pointer pma107.math.cuhk.edu.hk
[86400] 108.49.189.137.in-addr.arpa. domain name pointer pma108.math.cuhk.edu.hk
[86400] 109.49.189.137.in-addr.arpa. domain name pointer pma109.math.cuhk.edu.hk
[86400] 110.49.189.137.in-addr.arpa. domain name pointer pma110.math.cuhk.edu.hk
[86400] 111.49.189.137.in-addr.arpa. domain name pointer pma111.math.cuhk.edu.hk
[86400] 112.49.189.137.in-addr.arpa. domain name pointer pma112.math.cuhk.edu.hk
[86400] 113.49.189.137.in-addr.arpa. domain name pointer pma113.math.cuhk.edu.hk
[86400] 114.49.189.137.in-addr.arpa. domain name pointer pma114.math.cuhk.edu.hk
[86400] 115.49.189.137.in-addr.arpa. domain name pointer pma115.math.cuhk.edu.hk
[86400] 116.49.189.137.in-addr.arpa. domain name pointer pma116.math.cuhk.edu.hk
[86400] 117.49.189.137.in-addr.arpa. domain name pointer pma117.math.cuhk.edu.hk
[86400] 118.49.189.137.in-addr.arpa. domain name pointer pma118.math.cuhk.edu.hk
[86400] 119.49.189.137.in-addr.arpa. domain name pointer pma119.math.cuhk.edu.hk
[86400] 120.49.189.137.in-addr.arpa. domain name pointer pma120.math.cuhk.edu.hk
[86400] 121.49.189.137.in-addr.arpa. domain name pointer pma121.math.cuhk.edu.hk
[86400] 122.49.189.137.in-addr.arpa. domain name pointer pma122.math.cuhk.edu.hk
[86400] 123.49.189.137.in-addr.arpa. domain name pointer pma123.math.cuhk.edu.hk
[86400] 124.49.189.137.in-addr.arpa. domain name pointer pma124.math.cuhk.edu.hk
[86400] 125.49.189.137.in-addr.arpa. domain name pointer pma125.math.cuhk.edu.hk
[86400] 126.49.189.137.in-addr.arpa. domain name pointer pma126.math.cuhk.edu.hk
[86400] 127.49.189.137.in-addr.arpa. domain name pointer pma127.math.cuhk.edu.hk
[86400] 128.49.189.137.in-addr.arpa. domain name pointer pma128.math.cuhk.edu.hk
[0] 129.49.189.137.in-addr.arpa.: domain name does not exist
[86400] 130.49.189.137.in-addr.arpa. domain name pointer pma130.math.cuhk.edu.hk
[86400] 131.49.189.137.in-addr.arpa. domain name pointer pma131.math.cuhk.edu.hk
[86400] 132.49.189.137.in-addr.arpa. domain name pointer pma132.math.cuhk.edu.hk
[86400] 133.49.189.137.in-addr.arpa. domain name pointer pma133.math.cuhk.edu.hk
[86400] 134.49.189.137.in-addr.arpa. domain name pointer pma134.math.cuhk.edu.hk
[86400] 135.49.189.137.in-addr.arpa. domain name pointer pma135.math.cuhk.edu.hk
[0] 136.49.189.137.in-addr.arpa.: domain name does not exist
[86400] 137.49.189.137.in-addr.arpa. domain name pointer pma137.math.cuhk.edu.hk
[86400] 138.49.189.137.in-addr.arpa. domain name pointer pma138.math.cuhk.edu.hk
[86400] 139.49.189.137.in-addr.arpa. domain name pointer pma139.math.cuhk.edu.hk
[86400] 140.49.189.137.in-addr.arpa. domain name pointer pma140.math.cuhk.edu.hk
[86400] 141.49.189.137.in-addr.arpa. domain name pointer pma141.math.cuhk.edu.hk
[86400] 142.49.189.137.in-addr.arpa. domain name pointer pma142.math.cuhk.edu.hk
[86400] 143.49.189.137.in-addr.arpa. domain name pointer pma143.math.cuhk.edu.hk
[86400] 144.49.189.137.in-addr.arpa. domain name pointer pma144.math.cuhk.edu.hk
[86400] 145.49.189.137.in-addr.arpa. domain name pointer pma145.math.cuhk.edu.hk
[86400] 146.49.189.137.in-addr.arpa. domain name pointer pma146.math.cuhk.edu.hk
[86400] 147.49.189.137.in-addr.arpa. domain name pointer dhcp147.math.cuhk.edu.hk
[86400] 148.49.189.137.in-addr.arpa. domain name pointer dhcp148.math.cuhk.edu.hk
[86400] 149.49.189.137.in-addr.arpa. domain name pointer dhcp149.math.cuhk.edu.hk
[86400] 150.49.189.137.in-addr.arpa. domain name pointer dhcp150.math.cuhk.edu.hk
[86400] 151.49.189.137.in-addr.arpa. domain name pointer dhcp151.math.cuhk.edu.hk
[86400] 152.49.189.137.in-addr.arpa. domain name pointer dhcp152.math.cuhk.edu.hk
[86400] 153.49.189.137.in-addr.arpa. domain name pointer dhcp153.math.cuhk.edu.hk
[86400] 154.49.189.137.in-addr.arpa. domain name pointer dhcp154.math.cuhk.edu.hk
[86400] 155.49.189.137.in-addr.arpa. domain name pointer dhcp155.math.cuhk.edu.hk
[86400] 156.49.189.137.in-addr.arpa. domain name pointer dhcp156.math.cuhk.edu.hk
[86400] 157.49.189.137.in-addr.arpa. domain name pointer dhcp157.math.cuhk.edu.hk
[86400] 158.49.189.137.in-addr.arpa. domain name pointer dhcp158.math.cuhk.edu.hk
[86400] 159.49.189.137.in-addr.arpa. domain name pointer pma159.math.cuhk.edu.hk
[86400] 160.49.189.137.in-addr.arpa. domain name pointer pma160.math.cuhk.edu.hk
[86400] 161.49.189.137.in-addr.arpa. domain name pointer pma161.math.cuhk.edu.hk
[86400] 162.49.189.137.in-addr.arpa. domain name pointer pma162.math.cuhk.edu.hk
[86400] 163.49.189.137.in-addr.arpa. domain name pointer pma163.math.cuhk.edu.hk
[86400] 164.49.189.137.in-addr.arpa. domain name pointer pma164.math.cuhk.edu.hk
[86400] 165.49.189.137.in-addr.arpa. domain name pointer pma165.math.cuhk.edu.hk
[86400] 166.49.189.137.in-addr.arpa. domain name pointer pma166.math.cuhk.edu.hk
[86400] 167.49.189.137.in-addr.arpa. domain name pointer pma167.math.cuhk.edu.hk
[86400] 168.49.189.137.in-addr.arpa. domain name pointer pma168.math.cuhk.edu.hk
[86400] 169.49.189.137.in-addr.arpa. domain name pointer pma169.math.cuhk.edu.hk
[86400] 170.49.189.137.in-addr.arpa. domain name pointer pma170.math.cuhk.edu.hk
[86400] 171.49.189.137.in-addr.arpa. domain name pointer thunder.math.cuhk.edu.hk
[86400] 172.49.189.137.in-addr.arpa. domain name pointer firework.math.cuhk.edu.hk
[0] 173.49.189.137.in-addr.arpa.: domain name does not exist
[86400] 174.49.189.137.in-addr.arpa. domain name pointer starwall.math.cuhk.edu.hk
[0] 175.49.189.137.in-addr.arpa.: domain name does not exist
[86400] 176.49.189.137.in-addr.arpa. domain name pointer lab176.math.cuhk.edu.hk
[86400] 177.49.189.137.in-addr.arpa. domain name pointer lab177.math.cuhk.edu.hk
[86400] 178.49.189.137.in-addr.arpa. domain name pointer lab178.math.cuhk.edu.hk
[86400] 179.49.189.137.in-addr.arpa. domain name pointer lab179.math.cuhk.edu.hk
[86400] 180.49.189.137.in-addr.arpa. domain name pointer lab180.math.cuhk.edu.hk
[0] 181.49.189.137.in-addr.arpa.: domain name does not exist
[86400] 182.49.189.137.in-addr.arpa. domain name pointer lj101.math.cuhk.edu.hk
[0] 183.49.189.137.in-addr.arpa.: domain name does not exist
[0] 184.49.189.137.in-addr.arpa.: domain name does not exist
[0] 185.49.189.137.in-addr.arpa.: domain name does not exist
[0] 186.49.189.137.in-addr.arpa.: domain name does not exist
[86400] 187.49.189.137.in-addr.arpa. domain name pointer ep1290.math.cuhk.edu.hk
[86400] 188.49.189.137.in-addr.arpa. domain name pointer lj232.math.cuhk.edu.hk
[86400] 189.49.189.137.in-addr.arpa. domain name pointer lj220.math.cuhk.edu.hk
[86400] 190.49.189.137.in-addr.arpa. domain name pointer ricoh.math.cuhk.edu.hk
[0] 191.49.189.137.in-addr.arpa.: domain name does not exist
[86400] 192.49.189.137.in-addr.arpa. domain name pointer server2pma.math.cuhk.edu.hk
[86400] 193.49.189.137.in-addr.arpa. domain name pointer mai.math.cuhk.edu.hk
[86400] 194.49.189.137.in-addr.arpa. domain name pointer teichmuller.math.cuhk.edu.hk
[86400] 195.49.189.137.in-addr.arpa. domain name pointer kernel.math.cuhk.edu.hk
[86400] 196.49.189.137.in-addr.arpa. domain name pointer manifold.math.cuhk.edu.hk
[86400] 197.49.189.137.in-addr.arpa. domain name pointer wave.math.cuhk.edu.hk
[86400] 198.49.189.137.in-addr.arpa. domain name pointer gatekeeper.math.cuhk.edu.hk
[86400] 199.49.189.137.in-addr.arpa. domain name pointer server4pma.math.cuhk.edu.hk
[86400] 200.49.189.137.in-addr.arpa. domain name pointer server3pma.math.cuhk.edu.hk
[86400] 201.49.189.137.in-addr.arpa. domain name pointer newton.ims.cuhk.edu.hk
[86400] 202.49.189.137.in-addr.arpa. domain name pointer www.ims.cuhk.edu.hk
[86400] 203.49.189.137.in-addr.arpa. domain name pointer mail1.ims.cuhk.edu.hk
[86400] 204.49.189.137.in-addr.arpa. domain name pointer ftp.ims.cuhk.edu.hk
[0] 205.49.189.137.in-addr.arpa.: domain name does not exist
[0] 206.49.189.137.in-addr.arpa.: domain name does not exist
[0] 207.49.189.137.in-addr.arpa.: domain name does not exist
[0] 208.49.189.137.in-addr.arpa.: domain name does not exist
[0] 209.49.189.137.in-addr.arpa.: domain name does not exist
[0] 210.49.189.137.in-addr.arpa.: domain name does not exist
[0] 211.49.189.137.in-addr.arpa.: domain name does not exist
[0] 212.49.189.137.in-addr.arpa.: domain name does not exist
[0] 213.49.189.137.in-addr.arpa.: domain name does not exist
[0] 214.49.189.137.in-addr.arpa.: domain name does not exist
[0] 215.49.189.137.in-addr.arpa.: domain name does not exist
[0] 216.49.189.137.in-addr.arpa.: domain name does not exist
[0] 217.49.189.137.in-addr.arpa.: domain name does not exist
[0] 218.49.189.137.in-addr.arpa.: domain name does not exist
[0] 219.49.189.137.in-addr.arpa.: domain name does not exist
[0] 220.49.189.137.in-addr.arpa.: domain name does not exist
[0] 221.49.189.137.in-addr.arpa.: domain name does not exist
[0] 222.49.189.137.in-addr.arpa.: domain name does not exist
[0] 223.49.189.137.in-addr.arpa.: domain name does not exist
[0] 224.49.189.137.in-addr.arpa.: domain name does not exist
[0] 225.49.189.137.in-addr.arpa.: domain name does not exist
[0] 226.49.189.137.in-addr.arpa.: domain name does not exist
[0] 227.49.189.137.in-addr.arpa.: domain name does not exist
[0] 228.49.189.137.in-addr.arpa.: domain name does not exist
[0] 229.49.189.137.in-addr.arpa.: domain name does not exist
[0] 230.49.189.137.in-addr.arpa.: domain name does not exist
[0] 231.49.189.137.in-addr.arpa.: domain name does not exist
[0] 232.49.189.137.in-addr.arpa.: domain name does not exist
[0] 233.49.189.137.in-addr.arpa.: domain name does not exist
[0] 234.49.189.137.in-addr.arpa.: domain name does not exist
[0] 235.49.189.137.in-addr.arpa.: domain name does not exist
[0] 236.49.189.137.in-addr.arpa.: domain name does not exist
[0] 237.49.189.137.in-addr.arpa.: domain name does not exist
[0] 238.49.189.137.in-addr.arpa.: domain name does not exist
[0] 239.49.189.137.in-addr.arpa.: domain name does not exist
[0] 240.49.189.137.in-addr.arpa.: domain name does not exist
[0] 241.49.189.137.in-addr.arpa.: domain name does not exist
[0] 242.49.189.137.in-addr.arpa.: domain name does not exist
[86400] 243.49.189.137.in-addr.arpa. domain name pointer switch1.math.cuhk.edu.hk
[86400] 244.49.189.137.in-addr.arpa. domain name pointer switch2.math.cuhk.edu.hk
[86400] 245.49.189.137.in-addr.arpa. domain name pointer switch3.math.cuhk.edu.hk
[0] 246.49.189.137.in-addr.arpa.: domain name does not exist
[0] 247.49.189.137.in-addr.arpa.: domain name does not exist
[0] 248.49.189.137.in-addr.arpa.: domain name does not exist
[0] 249.49.189.137.in-addr.arpa.: domain name does not exist
[0] 250.49.189.137.in-addr.arpa.: domain name does not exist
[0] 251.49.189.137.in-addr.arpa.: domain name does not exist
[0] 252.49.189.137.in-addr.arpa.: domain name does not exist
[0] 253.49.189.137.in-addr.arpa.: domain name does not exist
[86400] 254.49.189.137.in-addr.arpa. domain name pointer gateway.math.cuhk.edu.hk
[0] 255.49.189.137.in-addr.arpa.: domain name does not exist