ccrf.com - dns.ninja

ccrf.com

DNSSEC⚠️ Not signed
A2600:1f14:ea2:fa00:ad1e:dccb:9d63:6744πŸ‡ΊπŸ‡Έ Amazon2600:1f14:800::/37 AMAZON AWS
A2600:1f14:ea2:fa01:db8:550:c5:d237πŸ‡ΊπŸ‡Έ Amazon2600:1f14:800::/37 AMAZON AWS
A34.214.55.183πŸ‡ΊπŸ‡Έ Amazon34.208.0.0/12 EC2 PDX prefix
A35.80.140.50πŸ‡ΊπŸ‡Έ Amazon35.80.0.0/12 EC2 PDX prefix
NSns1.venture.com ⭐
A34.217.229.194πŸ‡ΊπŸ‡Έ Amazon34.208.0.0/12 EC2 PDX prefix
PTRec2-34-217-229-194.us-west-2.compute.amazonaws.com
NSns2.venture.com
A44.226.97.88πŸ‡ΊπŸ‡Έ Amazon44.224.0.0/11 EC2 PDX prefix
PTRec2-44-226-97-88.us-west-2.compute.amazonaws.com
TXTv=spf1 -all
SOAns1.venture.comhostmaster@venture.com 2026-07-23 #6

com

Same first word

Similar names

DNS History

65 records (6 active, 59 former)

20162017201820192020202120222023202420252026NSns1.venture.comns2.venture.combuy.internettraffic.comns1.uniregistrymarket.linkns2.uniregistrymarket.linksell.internettraffic.comMX.A2600:1f14:ea2:fa00:ad1e:dccb:9d63:67442600:1f14:ea2:fa01:db8:550:c5:d23734.214.55.18335.80.140.50100.22.22.82100.22.74.214100.22.90.20916.145.160.210184.32.128.452600:1f14:ea2:fa00:1713:9b97:b768:9ec32600:1f14:ea2:fa00:4178:a5d9:ecf7:c6e32600:1f14:ea2:fa00:4478:73af:ab09:def32600:1f14:ea2:fa00:48d3:dda8:23f3:48ae2600:1f14:ea2:fa00:4c1:7e4e:d21e:49f02600:1f14:ea2:fa00:5a42:8e00:9582:ea102600:1f14:ea2:fa00:5c90:523b:34e1:6f32600:1f14:ea2:fa00:6c8a:e667:2376:7c482600:1f14:ea2:fa00:7172:f027:cc50:5b92600:1f14:ea2:fa00:929c:362d:623c:14ca2600:1f14:ea2:fa00:adf0:3752:c0d:c3992600:1f14:ea2:fa00:e75b:4a8e:e0a2:b8d2600:1f14:ea2:fa00:f592:7798:f38d:e8c52600:1f14:ea2:fa01:43a3:28c4:bcdb:6ad92600:1f14:ea2:fa01:5b52:2d92:f038:c2752600:1f14:ea2:fa01:5b9d:903b:3f1c:af5f2600:1f14:ea2:fa01:69b:9b5a:cc0a:1fb32600:1f14:ea2:fa01:7097:7d64:4c9b:62b2600:1f14:ea2:fa01:7585:b85b:1894:417d2600:1f14:ea2:fa01:7d3a:fb9e:4a9b:10032600:1f14:ea2:fa01:a1eb:3d9e:d858:c4632600:1f14:ea2:fa01:b1f8:382d:b00f:849b2600:1f14:ea2:fa01:d680:e94b:9ba8:99ce2600:1f14:ea2:fa01:dbb8:854f:f108:67bc2600:1f14:ea2:fa01:e366:6a6e:ffb7:5d0c2600:1f14:ea2:fa01:ee07:9530:c797:689e35.164.5.24835.165.142.13735.80.239.14544.224.153.6044.226.153.5844.231.121.8544.237.20.13344.239.87.1144.240.215.25044.241.127.16544.254.219.7952.11.200.2952.42.198.20852.89.172.1654.190.111.24054.200.72.23754.213.174.654.214.191.16054.218.19.12354.68.196.13654.69.174.22669.172.201.15369.172.201.208
β—‹NSbuy.internettraffic.com2015-08-22 β†’ 2016-07-09 Β· 4 obs
● 2015-08-22 20:46:50
● 2016-07-09 11:22:50
β—‹ 2017-03-16 13:10:50
β—‹ 2026-07-24 01:33:30
β—‹NSns1.uniregistrymarket.link2017-03-16 β†’ 2017-03-16 Β· 4 obs
β—‹ 2016-07-09 11:22:50
● 2017-03-16 13:10:50
β—‹ 2026-02-18 13:26:08
β—‹ 2026-07-24 01:33:30
●NSns1.venture.com2026-02-18 β†’ 2026-07-24 Β· 3 obs
β—‹ 2017-03-16 13:10:50
● 2026-02-18 13:26:08
● 2026-07-24 01:33:30
β—‹NSns2.uniregistrymarket.link2017-03-16 β†’ 2017-03-16 Β· 4 obs
β—‹ 2016-07-09 11:22:50
● 2017-03-16 13:10:50
β—‹ 2026-02-18 13:26:08
β—‹ 2026-07-24 01:33:30
●NSns2.venture.com2026-02-18 β†’ 2026-07-24 Β· 3 obs
β—‹ 2017-03-16 13:10:50
● 2026-02-18 13:26:08
● 2026-07-24 01:33:30
β—‹NSsell.internettraffic.com2015-08-22 β†’ 2016-07-09 Β· 4 obs
● 2015-08-22 20:46:50
● 2016-07-09 11:22:50
β—‹ 2017-03-16 13:10:50
β—‹ 2026-07-24 01:33:30
β—‹MX.2026-02-18 β†’ 2026-07-24 Β· 2 obs
β—‹ 2026-02-18 13:26:08
β—‹ 2026-07-24 01:33:30
β—‹A100.22.22.822026-02-26 β†’ 2026-02-26 Β· 4 obs
β—‹ 2026-02-20 05:03:08
● 2026-02-26 02:47:42
β—‹ 2026-03-24 18:22:12
β—‹ 2026-07-24 01:33:30
β—‹A100.22.74.2142026-02-18 β†’ 2026-07-24 Β· 2 obs
β—‹ 2026-02-18 13:26:08
β—‹ 2026-07-24 01:33:30
β—‹A100.22.90.2092026-04-13 β†’ 2026-04-15 Β· 5 obs
β—‹ 2026-04-05 17:54:50
● 2026-04-13 20:08:26
● 2026-04-15 21:07:18
β—‹ 2026-04-26 01:29:40
β—‹ 2026-07-24 01:33:30
β—‹A16.145.160.2102026-02-18 β†’ 2026-07-24 Β· 2 obs
β—‹ 2026-02-18 13:26:08
β—‹ 2026-07-24 01:33:30
β—‹A184.32.128.452026-03-24 β†’ 2026-03-24 Β· 4 obs
β—‹ 2026-02-26 02:47:42
● 2026-03-24 18:22:12
β—‹ 2026-03-27 04:38:52
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa00:1713:9b97:b768:9ec32026-05-15 β†’ 2026-05-15 Β· 4 obs
β—‹ 2026-04-26 01:29:40
● 2026-05-15 20:01:20
β—‹ 2026-05-20 13:59:12
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa00:4178:a5d9:ecf7:c6e32026-05-30 β†’ 2026-05-30 Β· 5 obs
β—‹ 2026-05-20 13:59:12
● 2026-05-30 00:28:10
● 2026-05-30 12:54:18
β—‹ 2026-06-14 23:52:24
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa00:4478:73af:ab09:def32026-06-30 β†’ 2026-06-30 Β· 4 obs
β—‹ 2026-06-14 23:52:24
● 2026-06-30 10:44:20
β—‹ 2026-07-24 01:33:28
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa00:48d3:dda8:23f3:48ae2026-04-13 β†’ 2026-04-15 Β· 5 obs
β—‹ 2026-04-05 17:54:50
● 2026-04-13 20:08:26
● 2026-04-15 21:07:18
β—‹ 2026-04-26 01:29:40
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa00:4c1:7e4e:d21e:49f02026-04-05 β†’ 2026-04-05 Β· 4 obs
β—‹ 2026-04-04 00:23:58
● 2026-04-05 17:54:50
β—‹ 2026-04-13 20:08:26
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa00:5a42:8e00:9582:ea102026-06-14 β†’ 2026-06-14 Β· 4 obs
β—‹ 2026-05-30 12:54:18
● 2026-06-14 23:52:24
β—‹ 2026-06-30 10:44:20
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa00:5c90:523b:34e1:6f32026-02-18 β†’ 2026-07-24 Β· 2 obs
β—‹ 2026-02-18 13:26:08
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa00:6c8a:e667:2376:7c482026-05-20 β†’ 2026-05-20 Β· 4 obs
β—‹ 2026-05-15 20:01:20
● 2026-05-20 13:59:12
β—‹ 2026-05-30 00:28:10
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa00:7172:f027:cc50:5b92026-04-26 β†’ 2026-04-26 Β· 4 obs
β—‹ 2026-04-15 21:07:18
● 2026-04-26 01:29:40
β—‹ 2026-05-15 20:01:20
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa00:929c:362d:623c:14ca2026-02-26 β†’ 2026-02-26 Β· 4 obs
β—‹ 2026-02-20 05:03:08
● 2026-02-26 02:47:42
β—‹ 2026-03-24 18:22:12
β—‹ 2026-07-24 01:33:30
●A2600:1f14:ea2:fa00:ad1e:dccb:9d63:67442026-07-24 β†’ 2026-07-24 Β· 3 obs
β—‹ 2026-06-30 10:44:20
● 2026-07-24 01:33:28
● 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa00:adf0:3752:c0d:c3992026-03-24 β†’ 2026-03-27 Β· 5 obs
β—‹ 2026-02-26 02:47:42
● 2026-03-24 18:22:12
● 2026-03-27 04:38:52
β—‹ 2026-04-03 16:46:30
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa00:e75b:4a8e:e0a2:b8d2026-04-03 β†’ 2026-04-04 Β· 5 obs
β—‹ 2026-03-27 04:38:52
● 2026-04-03 16:46:30
● 2026-04-04 00:23:58
β—‹ 2026-04-05 17:54:50
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa00:f592:7798:f38d:e8c52026-02-18 β†’ 2026-02-20 Β· 5 obs
β—‹ 2017-03-16 13:10:50
● 2026-02-18 13:26:08
● 2026-02-20 05:03:08
β—‹ 2026-02-26 02:47:42
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa01:43a3:28c4:bcdb:6ad92026-02-18 β†’ 2026-07-24 Β· 2 obs
β—‹ 2026-02-18 13:26:08
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa01:5b52:2d92:f038:c2752026-06-14 β†’ 2026-06-14 Β· 4 obs
β—‹ 2026-05-30 12:54:18
● 2026-06-14 23:52:24
β—‹ 2026-06-30 10:44:20
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa01:5b9d:903b:3f1c:af5f2026-03-24 β†’ 2026-03-24 Β· 4 obs
β—‹ 2026-02-26 02:47:42
● 2026-03-24 18:22:12
β—‹ 2026-03-27 04:38:52
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa01:69b:9b5a:cc0a:1fb32026-06-30 β†’ 2026-06-30 Β· 4 obs
β—‹ 2026-06-14 23:52:24
● 2026-06-30 10:44:20
β—‹ 2026-07-24 01:33:28
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa01:7097:7d64:4c9b:62b2026-03-27 β†’ 2026-03-27 Β· 4 obs
β—‹ 2026-03-24 18:22:12
● 2026-03-27 04:38:52
β—‹ 2026-04-03 16:46:30
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa01:7585:b85b:1894:417d2026-02-18 β†’ 2026-02-20 Β· 5 obs
β—‹ 2017-03-16 13:10:50
● 2026-02-18 13:26:08
● 2026-02-20 05:03:08
β—‹ 2026-02-26 02:47:42
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa01:7d3a:fb9e:4a9b:10032026-04-03 β†’ 2026-04-05 Β· 5 obs
β—‹ 2026-03-27 04:38:52
● 2026-04-03 16:46:30
● 2026-04-05 17:54:50
β—‹ 2026-04-13 20:08:26
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa01:a1eb:3d9e:d858:c4632026-05-15 β†’ 2026-05-15 Β· 4 obs
β—‹ 2026-04-26 01:29:40
● 2026-05-15 20:01:20
β—‹ 2026-05-20 13:59:12
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa01:b1f8:382d:b00f:849b2026-04-26 β†’ 2026-04-26 Β· 4 obs
β—‹ 2026-04-15 21:07:18
● 2026-04-26 01:29:40
β—‹ 2026-05-15 20:01:20
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa01:d680:e94b:9ba8:99ce2026-05-20 β†’ 2026-05-20 Β· 4 obs
β—‹ 2026-05-15 20:01:20
● 2026-05-20 13:59:12
β—‹ 2026-05-30 00:28:10
β—‹ 2026-07-24 01:33:30
●A2600:1f14:ea2:fa01:db8:550:c5:d2372026-07-24 β†’ 2026-07-24 Β· 3 obs
β—‹ 2026-06-30 10:44:20
● 2026-07-24 01:33:28
● 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa01:dbb8:854f:f108:67bc2026-04-13 β†’ 2026-04-15 Β· 5 obs
β—‹ 2026-04-05 17:54:50
● 2026-04-13 20:08:26
● 2026-04-15 21:07:18
β—‹ 2026-04-26 01:29:40
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa01:e366:6a6e:ffb7:5d0c2026-02-26 β†’ 2026-02-26 Β· 4 obs
β—‹ 2026-02-20 05:03:08
● 2026-02-26 02:47:42
β—‹ 2026-03-24 18:22:12
β—‹ 2026-07-24 01:33:30
β—‹A2600:1f14:ea2:fa01:ee07:9530:c797:689e2026-05-30 β†’ 2026-05-30 Β· 5 obs
β—‹ 2026-05-20 13:59:12
● 2026-05-30 00:28:10
● 2026-05-30 12:54:18
β—‹ 2026-06-14 23:52:24
β—‹ 2026-07-24 01:33:30
●A34.214.55.1832026-07-24 β†’ 2026-07-24 Β· 3 obs
β—‹ 2026-06-30 10:44:20
● 2026-07-24 01:33:28
● 2026-07-24 01:33:30
β—‹A35.164.5.2482026-04-03 β†’ 2026-04-05 Β· 5 obs
β—‹ 2026-03-27 04:38:52
● 2026-04-03 16:46:30
● 2026-04-05 17:54:50
β—‹ 2026-04-13 20:08:26
β—‹ 2026-07-24 01:33:30
β—‹A35.165.142.1372026-06-30 β†’ 2026-06-30 Β· 4 obs
β—‹ 2026-06-14 23:52:24
● 2026-06-30 10:44:20
β—‹ 2026-07-24 01:33:28
β—‹ 2026-07-24 01:33:30
●A35.80.140.502026-07-24 β†’ 2026-07-24 Β· 3 obs
β—‹ 2026-06-30 10:44:20
● 2026-07-24 01:33:28
● 2026-07-24 01:33:30
β—‹A35.80.239.1452026-05-30 β†’ 2026-05-30 Β· 5 obs
β—‹ 2026-05-20 13:59:12
● 2026-05-30 00:28:10
● 2026-05-30 12:54:18
β—‹ 2026-06-14 23:52:24
β—‹ 2026-07-24 01:33:30
β—‹A44.224.153.602026-02-26 β†’ 2026-02-26 Β· 4 obs
β—‹ 2026-02-20 05:03:08
● 2026-02-26 02:47:42
β—‹ 2026-03-24 18:22:12
β—‹ 2026-07-24 01:33:30
β—‹A44.226.153.582026-04-13 β†’ 2026-04-15 Β· 5 obs
β—‹ 2026-04-05 17:54:50
● 2026-04-13 20:08:26
● 2026-04-15 21:07:18
β—‹ 2026-04-26 01:29:40
β—‹ 2026-07-24 01:33:30
β—‹A44.231.121.852026-05-20 β†’ 2026-05-20 Β· 4 obs
β—‹ 2026-05-15 20:01:20
● 2026-05-20 13:59:12
β—‹ 2026-05-30 00:28:10
β—‹ 2026-07-24 01:33:30
β—‹A44.237.20.1332026-06-14 β†’ 2026-06-14 Β· 4 obs
β—‹ 2026-05-30 12:54:18
● 2026-06-14 23:52:24
β—‹ 2026-06-30 10:44:20
β—‹ 2026-07-24 01:33:30
β—‹A44.239.87.112026-04-03 β†’ 2026-04-04 Β· 5 obs
β—‹ 2026-03-27 04:38:52
● 2026-04-03 16:46:30
● 2026-04-04 00:23:58
β—‹ 2026-04-05 17:54:50
β—‹ 2026-07-24 01:33:30
β—‹A44.240.215.2502026-04-26 β†’ 2026-04-26 Β· 4 obs
β—‹ 2026-04-15 21:07:18
● 2026-04-26 01:29:40
β—‹ 2026-05-15 20:01:20
β—‹ 2026-07-24 01:33:30
β—‹A44.241.127.1652026-04-05 β†’ 2026-04-05 Β· 4 obs
β—‹ 2026-04-04 00:23:58
● 2026-04-05 17:54:50
β—‹ 2026-04-13 20:08:26
β—‹ 2026-07-24 01:33:30
β—‹A44.254.219.792026-05-15 β†’ 2026-05-15 Β· 4 obs
β—‹ 2026-04-26 01:29:40
● 2026-05-15 20:01:20
β—‹ 2026-05-20 13:59:12
β—‹ 2026-07-24 01:33:30
β—‹A52.11.200.292026-05-15 β†’ 2026-05-15 Β· 4 obs
β—‹ 2026-04-26 01:29:40
● 2026-05-15 20:01:20
β—‹ 2026-05-20 13:59:12
β—‹ 2026-07-24 01:33:30
β—‹A52.42.198.2082026-02-18 β†’ 2026-02-20 Β· 5 obs
β—‹ 2017-03-16 13:10:50
● 2026-02-18 13:26:08
● 2026-02-20 05:03:08
β—‹ 2026-02-26 02:47:42
β—‹ 2026-07-24 01:33:30
β—‹A52.89.172.162026-05-30 β†’ 2026-05-30 Β· 5 obs
β—‹ 2026-05-20 13:59:12
● 2026-05-30 00:28:10
● 2026-05-30 12:54:18
β—‹ 2026-06-14 23:52:24
β—‹ 2026-07-24 01:33:30
β—‹A54.190.111.2402026-02-18 β†’ 2026-02-20 Β· 5 obs
β—‹ 2017-03-16 13:10:50
● 2026-02-18 13:26:08
● 2026-02-20 05:03:08
β—‹ 2026-02-26 02:47:42
β—‹ 2026-07-24 01:33:30
β—‹A54.200.72.2372026-06-14 β†’ 2026-06-14 Β· 4 obs
β—‹ 2026-05-30 12:54:18
● 2026-06-14 23:52:24
β—‹ 2026-06-30 10:44:20
β—‹ 2026-07-24 01:33:30
β—‹A54.213.174.62026-04-26 β†’ 2026-04-26 Β· 4 obs
β—‹ 2026-04-15 21:07:18
● 2026-04-26 01:29:40
β—‹ 2026-05-15 20:01:20
β—‹ 2026-07-24 01:33:30
β—‹A54.214.191.1602026-06-30 β†’ 2026-06-30 Β· 4 obs
β—‹ 2026-06-14 23:52:24
● 2026-06-30 10:44:20
β—‹ 2026-07-24 01:33:28
β—‹ 2026-07-24 01:33:30
β—‹A54.218.19.1232026-05-20 β†’ 2026-05-20 Β· 4 obs
β—‹ 2026-05-15 20:01:20
● 2026-05-20 13:59:12
β—‹ 2026-05-30 00:28:10
β—‹ 2026-07-24 01:33:30
β—‹A54.68.196.1362026-03-27 β†’ 2026-03-27 Β· 4 obs
β—‹ 2026-03-24 18:22:12
● 2026-03-27 04:38:52
β—‹ 2026-04-03 16:46:30
β—‹ 2026-07-24 01:33:30
β—‹A54.69.174.2262026-03-24 β†’ 2026-03-27 Β· 5 obs
β—‹ 2026-02-26 02:47:42
● 2026-03-24 18:22:12
● 2026-03-27 04:38:52
β—‹ 2026-04-03 16:46:30
β—‹ 2026-07-24 01:33:30
β—‹A69.172.201.1532016-07-09 β†’ 2017-03-16 Β· 5 obs
β—‹ 2015-12-11 23:05:44
● 2016-07-09 11:22:50
● 2017-03-16 13:10:50
β—‹ 2026-02-18 13:26:08
β—‹ 2026-07-24 01:33:30
β—‹A69.172.201.2082015-08-22 β†’ 2015-12-11 Β· 4 obs
● 2015-08-22 20:46:50
● 2015-12-11 23:05:44
β—‹ 2016-07-09 11:22:50
β—‹ 2026-07-24 01:33:30

πŸ” DNS Trace

πŸ“‹ Delegation Chain

ZoneNameserversGlue
coma.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...-
ccrf.comns2.venture.com, ns1.venture.com2 records

βœ… Authoritative Response

Server:44.226.97.88

NS records: ns2.venture.com, ns1.venture.com

πŸ”’ DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for ccrf.com (unsigned zone)

⏱️ Timing

Total: 597ms | Queries: -

πŸ“„ Records

TypeCountSample Data
A234.214.55.183, 35.80.140.50
AAAA22600:1f14:ea2:fa00:ad1e:dccb:9d63:6744, 2600:1f14:ea2:fa01:db8:550:c5:d237
NS2ns1.venture.com, ns2.venture.com
MX1. (pri: 0)
TXT1v=spf1 -all
SOA1ns1.venture.com hostmaster.venture.com

πŸ“Œ Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns2.venture.com, ns1.venture.com)

Analysis

IP Addresses

ccrf.com resolves to four IP addresses: 34.214.55.183, 35.80.140.50, 2600:1f14:ea2:fa00:ad1e:dccb:9d63:6744 and 2600:1f14:ea2:fa01:db8:550:c5:d237.

Additional host names β€” mlnq.com, hnlp.com, drysuit.com and two others β€” share IP numbers with ccrf.com.

Name Servers

DNS delegation for ccrf.com points to two name servers: ns1.venture.com and ns2.venture.com.

ccrf.com shares its name server setup with other domains, including etmk.com, scallops.com, itut.com and two others.

ns1.venture.com directs to 34.217.229.194 and ns2.venture.com directs to 44.226.97.88; each host name points to exactly one IP number.