[0] 0.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 1.56.179.152.in-addr.arpa. domain name pointer 500.Serial1-0-6-26-0.GW9.NYC4.ALTER.NET
[21600] 2.56.179.152.in-addr.arpa. domain name pointer alm-islip-gw.customer.alter.net
[0] 3.56.179.152.in-addr.arpa.: domain name does not exist
[0] 4.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 5.56.179.152.in-addr.arpa. domain name pointer 500.MFR965.GW14.NYC4.ALTER.NET
[21600] 6.56.179.152.in-addr.arpa. domain name pointer adfmgt-gw.customer.alter.net
[0] 7.56.179.152.in-addr.arpa.: domain name does not exist
[0] 8.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 9.56.179.152.in-addr.arpa. domain name pointer 220.GigabitEthernet4-3.GW12.NYC4.ALTER.NET
[21600] 10.56.179.152.in-addr.arpa. domain name pointer us-mufg-gw.customer.alter.net
[0] 11.56.179.152.in-addr.arpa.: domain name does not exist
[0] 12.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 13.56.179.152.in-addr.arpa. domain name pointer 500.Serial1-0-9-22-0.GW9.NYC4.ALTER.NET
[21600] 14.56.179.152.in-addr.arpa. domain name pointer domcameracompany-gw.customer.alter.net
[0] 15.56.179.152.in-addr.arpa.: domain name does not exist
[0] 16.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 17.56.179.152.in-addr.arpa. domain name pointer 500.Serial1-0-8-1-0.GW9.NYC4.ALTER.NET
[21600] 18.56.179.152.in-addr.arpa. domain name pointer bakemyday-gw.customer.alter.net
[0] 19.56.179.152.in-addr.arpa.: domain name does not exist
[0] 20.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 21.56.179.152.in-addr.arpa. domain name pointer 293.ATM1-1.GW3.NYC4.ALTER.NET
[21600] 22.56.179.152.in-addr.arpa. domain name pointer reservoircap-gw.customer.alter.net
[0] 23.56.179.152.in-addr.arpa.: domain name does not exist
[0] 24.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 25.56.179.152.in-addr.arpa. domain name pointer 219.GigabitEthernet4-3.GW12.NYC4.ALTER.NET
[21600] 26.56.179.152.in-addr.arpa. domain name pointer iaenglander-gw.customer.alter.net
[0] 27.56.179.152.in-addr.arpa.: domain name does not exist
[0] 28.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 29.56.179.152.in-addr.arpa. domain name pointer 500.Serial0-2-2-28-0.GW18.NYC4.ALTER.NET
[21600] 30.56.179.152.in-addr.arpa. domain name pointer aol-gw.customer.alter.net
[0] 31.56.179.152.in-addr.arpa.: domain name does not exist
[0] 32.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 33.56.179.152.in-addr.arpa. domain name pointer 398.TenGigE0-0-0-0.GW5.NYC4.ALTER.NET
[21600] 34.56.179.152.in-addr.arpa. domain name pointer Internet-gw.customer.alter.net
[0] 35.56.179.152.in-addr.arpa.: domain name does not exist
[0] 36.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 37.56.179.152.in-addr.arpa. domain name pointer 500.Serial3-3-3-9-0.GW18.NYC4.ALTER.NET
[21600] 38.56.179.152.in-addr.arpa. domain name pointer spectrumcontrol-gw.customer.alter.net
[0] 39.56.179.152.in-addr.arpa.: domain name does not exist
[0] 40.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 41.56.179.152.in-addr.arpa. domain name pointer 500.MFR1932.GW18.NYC4.ALTER.NET
[21600] 42.56.179.152.in-addr.arpa. domain name pointer managedfunds-gw.customer.alter.net
[0] 43.56.179.152.in-addr.arpa.: domain name does not exist
[0] 44.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 45.56.179.152.in-addr.arpa. domain name pointer 500.Serial3-3-0-15-0.GW18.NYC4.ALTER.NET
[21600] 46.56.179.152.in-addr.arpa. domain name pointer charming-gw.customer.alter.net
[0] 47.56.179.152.in-addr.arpa.: domain name does not exist
[0] 48.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 49.56.179.152.in-addr.arpa. domain name pointer 500.Serial3-1-3-24-0.GW18.NYC4.ALTER.NET
[21600] 50.56.179.152.in-addr.arpa. domain name pointer flvns-gw.customer.alter.net
[0] 51.56.179.152.in-addr.arpa.: domain name does not exist
[0] 52.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 53.56.179.152.in-addr.arpa. domain name pointer 206.GigabitEthernet0-0-2-0.GW8.NYC4.ALTER.NET
[21600] 54.56.179.152.in-addr.arpa. domain name pointer 911memorial-gw.customer.alter.net
[0] 55.56.179.152.in-addr.arpa.: domain name does not exist
[0] 56.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 57.56.179.152.in-addr.arpa. domain name pointer 339.TenGigE0-0-0-0.GW5.NYC4.ALTER.NET
[21600] 58.56.179.152.in-addr.arpa. domain name pointer abco-gw.customer.alter.net
[0] 59.56.179.152.in-addr.arpa.: domain name does not exist
[0] 60.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 61.56.179.152.in-addr.arpa. domain name pointer 389.TenGigE0-0-0-0.GW5.NYC4.ALTER.NET
[21600] 62.56.179.152.in-addr.arpa. domain name pointer oovoo.com-gw.customer.alter.net
[0] 63.56.179.152.in-addr.arpa.: domain name does not exist
[0] 64.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 65.56.179.152.in-addr.arpa. domain name pointer 500.Serial3-1-3-7-0.GW18.NYC4.ALTER.NET
[21600] 66.56.179.152.in-addr.arpa. domain name pointer aol-gw.customer.alter.net
[0] 67.56.179.152.in-addr.arpa.: domain name does not exist
[0] 68.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 69.56.179.152.in-addr.arpa. domain name pointer 226.GigabitEthernet4-3.GW12.NYC4.ALTER.NET
[21600] 70.56.179.152.in-addr.arpa. domain name pointer LCPS-gw.customer.alter.net
[0] 71.56.179.152.in-addr.arpa.: domain name does not exist
[0] 72.56.179.152.in-addr.arpa.: domain name does not exist
[0] 73.56.179.152.in-addr.arpa.: domain name does not exist
[0] 74.56.179.152.in-addr.arpa.: domain name does not exist
[0] 75.56.179.152.in-addr.arpa.: domain name does not exist
[0] 76.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 77.56.179.152.in-addr.arpa. domain name pointer Serial5-3-4.GW12.NYC4.ALTER.NET
[21600] 78.56.179.152.in-addr.arpa. domain name pointer richemont-gw.customer.alter.net
[0] 79.56.179.152.in-addr.arpa.: domain name does not exist
[0] 80.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 81.56.179.152.in-addr.arpa. domain name pointer 224.GigabitEthernet4-3.GW12.NYC4.ALTER.NET
[21600] 82.56.179.152.in-addr.arpa. domain name pointer OPTISGROUPLLC-gw.customer.alter.net
[0] 83.56.179.152.in-addr.arpa.: domain name does not exist
[0] 84.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 85.56.179.152.in-addr.arpa. domain name pointer 500.MFR3756.GW3.NYC4.ALTER.NET
[21600] 86.56.179.152.in-addr.arpa. domain name pointer g4si-gw.customer.alter.net
[0] 87.56.179.152.in-addr.arpa.: domain name does not exist
[0] 88.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 89.56.179.152.in-addr.arpa. domain name pointer 500.Serial0-0-2-24-0.GW18.NYC4.ALTER.NET
[21600] 90.56.179.152.in-addr.arpa. domain name pointer gmail-gw.customer.alter.net
[0] 91.56.179.152.in-addr.arpa.: domain name does not exist
[0] 92.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 93.56.179.152.in-addr.arpa. domain name pointer 227.GigabitEthernet4-3.GW12.NYC4.ALTER.NET
[21600] 94.56.179.152.in-addr.arpa. domain name pointer gibney-gw.customer.alter.net
[0] 95.56.179.152.in-addr.arpa.: domain name does not exist
[0] 96.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 97.56.179.152.in-addr.arpa. domain name pointer 346.TenGigE0-0-0-0.GW5.NYC4.ALTER.NET
[21600] 98.56.179.152.in-addr.arpa. domain name pointer firestardiamond-gw.customer.alter.net
[0] 99.56.179.152.in-addr.arpa.: domain name does not exist
[0] 100.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 101.56.179.152.in-addr.arpa. domain name pointer 500.Serial0-3-1-19-0.GW18.NYC4.ALTER.NET
[21600] 102.56.179.152.in-addr.arpa. domain name pointer protectiveliningcorpny-gw.customer.alter.net
[0] 103.56.179.152.in-addr.arpa.: domain name does not exist
[0] 104.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 105.56.179.152.in-addr.arpa. domain name pointer 500.Serial0-2-1-8-0.GW18.NYC4.ALTER.NET
[21600] 106.56.179.152.in-addr.arpa. domain name pointer joeyshowroom-gw.customer.alter.net
[0] 107.56.179.152.in-addr.arpa.: domain name does not exist
[0] 108.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 109.56.179.152.in-addr.arpa. domain name pointer 198.TenGigE0-0-0-0.GW5.NYC4.ALTER.NET
[21600] 110.56.179.152.in-addr.arpa. domain name pointer Internet-gw.customer.alter.net
[0] 111.56.179.152.in-addr.arpa.: domain name does not exist
[0] 112.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 113.56.179.152.in-addr.arpa. domain name pointer 231.GigabitEthernet4-3.GW12.NYC4.ALTER.NET
[21600] 114.56.179.152.in-addr.arpa. domain name pointer isigrp-gw.customer.alter.net
[0] 115.56.179.152.in-addr.arpa.: domain name does not exist
[0] 116.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 117.56.179.152.in-addr.arpa. domain name pointer 342.ATM1-1.GW14.NYC4.ALTER.NET
[21600] 118.56.179.152.in-addr.arpa. domain name pointer sionline-gw.customer.alter.net
[0] 119.56.179.152.in-addr.arpa.: domain name does not exist
[0] 120.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 121.56.179.152.in-addr.arpa. domain name pointer 230.GigabitEthernet4-3.GW12.NYC4.ALTER.NET
[21600] 122.56.179.152.in-addr.arpa. domain name pointer rosenbergestis-gw.customer.alter.net
[0] 123.56.179.152.in-addr.arpa.: domain name does not exist
[0] 124.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 125.56.179.152.in-addr.arpa. domain name pointer 500.Serial5-0-10-25-0.GW7.NYC4.ALTER.NET
[21600] 126.56.179.152.in-addr.arpa. domain name pointer hotmail-gw.customer.alter.net
[0] 127.56.179.152.in-addr.arpa.: domain name does not exist
[0] 128.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 129.56.179.152.in-addr.arpa. domain name pointer 500.Serial4-0-12-9-0.GW14.NYC4.ALTER.NET
[21600] 130.56.179.152.in-addr.arpa. domain name pointer beautyinny-gw.customer.alter.net
[0] 131.56.179.152.in-addr.arpa.: domain name does not exist
[0] 132.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 133.56.179.152.in-addr.arpa. domain name pointer 500.MFR870.GW14.NYC4.ALTER.NET
[21600] 134.56.179.152.in-addr.arpa. domain name pointer delcath-gw.customer.alter.net
[0] 135.56.179.152.in-addr.arpa.: domain name does not exist
[0] 136.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 137.56.179.152.in-addr.arpa. domain name pointer 500.MFR680.GW9.NYC4.ALTER.NET
[21600] 138.56.179.152.in-addr.arpa. domain name pointer ezecastle-gw.customer.alter.net
[0] 139.56.179.152.in-addr.arpa.: domain name does not exist
[0] 140.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 141.56.179.152.in-addr.arpa. domain name pointer 500.MFR346.GW9.NYC4.ALTER.NET
[21600] 142.56.179.152.in-addr.arpa. domain name pointer pkmminc-gw.customer.alter.net
[0] 143.56.179.152.in-addr.arpa.: domain name does not exist
[0] 144.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 145.56.179.152.in-addr.arpa. domain name pointer 500.Serial0-3-1-1-0.GW18.NYC4.ALTER.NET
[21600] 146.56.179.152.in-addr.arpa. domain name pointer frklaw-gw.customer.alter.net
[0] 147.56.179.152.in-addr.arpa.: domain name does not exist
[0] 148.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 149.56.179.152.in-addr.arpa. domain name pointer 207.GigabitEthernet4-3.GW12.NYC4.ALTER.NET
[21600] 150.56.179.152.in-addr.arpa. domain name pointer misys-gw.customer.alter.net
[0] 151.56.179.152.in-addr.arpa.: domain name does not exist
[0] 152.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 153.56.179.152.in-addr.arpa. domain name pointer 500.MFR600.GW14.NYC4.ALTER.NET
[21600] 154.56.179.152.in-addr.arpa. domain name pointer targetcast-gw.customer.alter.net
[0] 155.56.179.152.in-addr.arpa.: domain name does not exist
[0] 156.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 157.56.179.152.in-addr.arpa. domain name pointer 28.GigabitEthernet0-0-2-0.GW8.NYC4.ALTER.NET
[21600] 158.56.179.152.in-addr.arpa. domain name pointer Internet-gw.customer.alter.net
[0] 159.56.179.152.in-addr.arpa.: domain name does not exist
[0] 160.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 161.56.179.152.in-addr.arpa. domain name pointer 500.Serial1-0-11-10-0.GW9.NYC4.ALTER.NET
[21600] 162.56.179.152.in-addr.arpa. domain name pointer umdnj.edu.customer.alter.net
[0] 163.56.179.152.in-addr.arpa.: domain name does not exist
[0] 164.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 165.56.179.152.in-addr.arpa. domain name pointer 500.Serial3-3-1-3-0.GW18.NYC4.ALTER.NET
[21600] 166.56.179.152.in-addr.arpa. domain name pointer lockmansystems-gw.customer.alter.net
[0] 167.56.179.152.in-addr.arpa.: domain name does not exist
[0] 168.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 169.56.179.152.in-addr.arpa. domain name pointer 209.GigabitEthernet4-3.GW12.NYC4.ALTER.NET
[21600] 170.56.179.152.in-addr.arpa. domain name pointer Internet-gw.customer.alter.net
[0] 171.56.179.152.in-addr.arpa.: domain name does not exist
[0] 172.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 173.56.179.152.in-addr.arpa. domain name pointer 594.ATM1-1.GW14.NYC4.ALTER.NET
[21600] 174.56.179.152.in-addr.arpa. domain name pointer schiavone-gw.customer.alter.net
[0] 175.56.179.152.in-addr.arpa.: domain name does not exist
[0] 176.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 177.56.179.152.in-addr.arpa. domain name pointer 500.Serial0-1-0-4-0.GW18.NYC4.ALTER.NET
[21600] 178.56.179.152.in-addr.arpa. domain name pointer jagersmith-gw.customer.alter.net
[0] 179.56.179.152.in-addr.arpa.: domain name does not exist
[0] 180.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 181.56.179.152.in-addr.arpa. domain name pointer 500.Serial4-0-11-12-0.GW14.NYC4.ALTER.NET
[21600] 182.56.179.152.in-addr.arpa. domain name pointer rmginv-gw.customer.alter.net
[0] 183.56.179.152.in-addr.arpa.: domain name does not exist
[0] 184.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 185.56.179.152.in-addr.arpa. domain name pointer 218.GigabitEthernet3-1-0.GW1.NYC4.ALTER.NET
[21600] 186.56.179.152.in-addr.arpa. domain name pointer cambridge-gw.customer.alter.net
[0] 187.56.179.152.in-addr.arpa.: domain name does not exist
[0] 188.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 189.56.179.152.in-addr.arpa. domain name pointer 500.Serial1-0-10-22-0.GW9.NYC4.ALTER.NET
[21600] 190.56.179.152.in-addr.arpa. domain name pointer adp-gw.customer.alter.net
[0] 191.56.179.152.in-addr.arpa.: domain name does not exist
[0] 192.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 193.56.179.152.in-addr.arpa. domain name pointer 500.Serial1-0-10-19-0.GW9.NYC4.ALTER.NET
[21600] 194.56.179.152.in-addr.arpa. domain name pointer springscalffolding-gw.customer.alter.net
[0] 195.56.179.152.in-addr.arpa.: domain name does not exist
[0] 196.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 197.56.179.152.in-addr.arpa. domain name pointer GigabitEthernet3-1-7.GW1.NYC4.ALTER.NET
[21600] 198.56.179.152.in-addr.arpa. domain name pointer u279910-gw.customer.alter.net
[0] 199.56.179.152.in-addr.arpa.: domain name does not exist
[0] 200.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 201.56.179.152.in-addr.arpa. domain name pointer 500.MFR802.GW9.NYC4.ALTER.NET
[21600] 202.56.179.152.in-addr.arpa. domain name pointer kmm-gw.customer.alter.net
[0] 203.56.179.152.in-addr.arpa.: domain name does not exist
[0] 204.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 205.56.179.152.in-addr.arpa. domain name pointer 202.GigabitEthernet0-0-2-0.GW8.NYC4.ALTER.NET
[21600] 206.56.179.152.in-addr.arpa. domain name pointer skyauction-gw.customer.alter.net
[0] 207.56.179.152.in-addr.arpa.: domain name does not exist
[0] 208.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 209.56.179.152.in-addr.arpa. domain name pointer 554.ATM1-1.GW3.NYC4.ALTER.NET
[21600] 210.56.179.152.in-addr.arpa. domain name pointer bbmcc-gw.customer.alter.net
[0] 211.56.179.152.in-addr.arpa.: domain name does not exist
[0] 212.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 213.56.179.152.in-addr.arpa. domain name pointer 287.TenGigE0-0-0-0.GW1.NYC4.ALTER.NET
[21600] 214.56.179.152.in-addr.arpa. domain name pointer mediawhiz-gw.customer.alter.net
[0] 215.56.179.152.in-addr.arpa.: domain name does not exist
[0] 216.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 217.56.179.152.in-addr.arpa. domain name pointer 500.Serial3-3-1-6-0.GW18.NYC4.ALTER.NET
[21600] 218.56.179.152.in-addr.arpa. domain name pointer eliasfragrance-gw.customer.alter.net
[0] 219.56.179.152.in-addr.arpa.: domain name does not exist
[0] 220.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 221.56.179.152.in-addr.arpa. domain name pointer 203.TenGigE0-0-0-0.GW5.NYC4.ALTER.NET
[21600] 222.56.179.152.in-addr.arpa. domain name pointer unpd-gw.customer.alter.net
[0] 223.56.179.152.in-addr.arpa.: domain name does not exist
[0] 224.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 225.56.179.152.in-addr.arpa. domain name pointer 500.Serial1-0-9-21-0.GW9.NYC4.ALTER.NET
[21600] 226.56.179.152.in-addr.arpa. domain name pointer yahoo-gw.customer.alter.net
[0] 227.56.179.152.in-addr.arpa.: domain name does not exist
[0] 228.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 229.56.179.152.in-addr.arpa. domain name pointer 500.Serial3-3-3-13-0.GW18.NYC4.ALTER.NET
[21600] 230.56.179.152.in-addr.arpa. domain name pointer generalsportwear-gw.customer.alter.net
[0] 231.56.179.152.in-addr.arpa.: domain name does not exist
[0] 232.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 233.56.179.152.in-addr.arpa. domain name pointer 210.GigabitEthernet4-3.GW12.NYC4.ALTER.NET
[21600] 234.56.179.152.in-addr.arpa. domain name pointer waterfrontmedia-gw1.customer.alter.net
[0] 235.56.179.152.in-addr.arpa.: domain name does not exist
[0] 236.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 237.56.179.152.in-addr.arpa. domain name pointer 232.GigabitEthernet4-3.GW12.NYC4.ALTER.NET
[21600] 238.56.179.152.in-addr.arpa. domain name pointer waterfrontmedia-gw2.customer.alter.net
[0] 239.56.179.152.in-addr.arpa.: domain name does not exist
[0] 240.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 241.56.179.152.in-addr.arpa. domain name pointer 500.Serial4-3-3-11-0.GW18.NYC4.ALTER.NET
[21600] 242.56.179.152.in-addr.arpa. domain name pointer richardleeds-gw.customer.alter.net
[0] 243.56.179.152.in-addr.arpa.: domain name does not exist
[0] 244.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 245.56.179.152.in-addr.arpa. domain name pointer 500.Serial1-0-10-2-0.GW9.NYC4.ALTER.NET
[21600] 246.56.179.152.in-addr.arpa. domain name pointer adp-flanders-gw.customer.alter.net
[0] 247.56.179.152.in-addr.arpa.: domain name does not exist
[0] 248.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 249.56.179.152.in-addr.arpa. domain name pointer 500.Serial3-2-3-16-0.GW18.NYC4.ALTER.NET
[21600] 250.56.179.152.in-addr.arpa. domain name pointer eci-gw.customer.alter.net
[0] 251.56.179.152.in-addr.arpa.: domain name does not exist
[0] 252.56.179.152.in-addr.arpa.: domain name does not exist
[21600] 253.56.179.152.in-addr.arpa. domain name pointer 105.TenGigE0-0-0-0.GW5.NYC4.ALTER.NET
[21600] 254.56.179.152.in-addr.arpa. domain name pointer Internet-gw.customer.alter.net
[0] 255.56.179.152.in-addr.arpa.: domain name does not exist