bitundo.com - dns.ninja

bitundo.com

DNSSEC⚠️ Not signed
A2600:1f18:4ae:c607:5974:bfa8:d54b:7fe5πŸ‡ΊπŸ‡Έ Amazon2600:1f18::/35 AMAZON EC2 IAD prefix
A2600:1f18:4ae:c608:1ae1:9fc3:6ee2:84ddπŸ‡ΊπŸ‡Έ Amazon2600:1f18::/35 AMAZON EC2 IAD prefix
A44.208.83.180πŸ‡ΊπŸ‡Έ Amazon44.192.0.0/11 EC2 IAD prefix
A54.84.240.235πŸ‡ΊπŸ‡Έ Amazon54.84.0.0/15 EC2 IAD prefix
NSns1.namebrightdns.com ⭐
A2600:1f18:683a:ae1a:c41d:b4cf:322b:2aa6πŸ‡ΊπŸ‡Έ Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A3.89.42.183πŸ‡ΊπŸ‡Έ Amazon3.80.0.0/12 EC2 IAD prefix
PTRec2-3-89-42-183.compute-1.amazonaws.com
A100.58.124.42πŸ‡ΊπŸ‡Έ Amazon100.48.0.0/12 EC2 IAD prefix
PTRec2-100-58-124-42.compute-1.amazonaws.com
NSexpired1.namebrightdns.com
A2600:1f18:683a:ae1a:b0bf:3f0f:12cd:e9b5πŸ‡ΊπŸ‡Έ Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A3.90.47.36πŸ‡ΊπŸ‡Έ Amazon3.80.0.0/12 EC2 IAD prefix
PTRec2-3-90-47-36.compute-1.amazonaws.com
NSexpired2.namebrightdns.com
A2600:1f18:683a:ae1b:80e1:c13b:b873:a981πŸ‡ΊπŸ‡Έ Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A184.73.13.244πŸ‡ΊπŸ‡Έ Amazon184.73.0.0/16 IAD prefix
PTRec2-184-73-13-244.compute-1.amazonaws.com
MXmail1.namebrightmail.com ⭐
A66.35.35.26πŸ‡ΊπŸ‡Έ IMDC66.35.35.0/24 Iron Mountain Data Center
PTRmail1.namebrightmail.com
MXmail2.namebrightmail.com ⭐
A66.35.35.28πŸ‡ΊπŸ‡Έ IMDC66.35.35.0/24 Iron Mountain Data Center
PTRmail2.namebrightmail.com
TXTgoogle-site-verification=YourUniqueGoogleVerificationCode
TXTv=spf1 a:smtpout1.namebrightmail.com a:smtpout2.namebrightmail.com ip4:216.87...
SOAns1.namebrightdns.comdns@namebright.com 2026-08-08 #1

com

Subdomains

Same first word

Similar names

DNS History

44 records (9 active, 35 former)

20162017201820192020202120222023202420252026NSexpired1.namebrightdns.comexpired2.namebrightdns.comns1.namebrightdns.comaaron.ns.cloudflare.commelissa.ns.cloudflare.comns-101.awsdns-12.comns-1257.awsdns-29.orgns-1933.awsdns-49.co.ukns-877.awsdns-45.netMXmail1.namebrightmail.commail2.namebrightmail.commx.zohomail.commx2.zohomail.comA2600:1f18:4ae:c607:5974:bfa8:d54b:7fe52600:1f18:4ae:c608:1ae1:9fc3:6ee2:84dd44.208.83.18054.84.240.235104.21.34.28172.67.167.213188.114.96.0188.114.96.4188.114.97.0188.114.97.42606:4700:3032::6815:221c2606:4700:3032::ac43:a7d52606:4700:3034::6815:221c2606:4700:3036::ac43:a7d52a06:98c1:3120::2a06:98c1:3120::42a06:98c1:3121::2a06:98c1:3121::454.231.160.14754.231.161.18754.231.162.12354.231.162.3554.231.162.5954.231.168.10754.231.168.13154.231.168.19954.231.168.2354.231.168.3954.231.176.11554.231.184.2754.231.185.43
β—‹NSaaron.ns.cloudflare.com2026-06-03 β†’ 2026-06-03 Β· 4 obs
β—‹ 2016-09-13 20:43:26
● 2026-06-03 17:46:20
β—‹ 2026-07-31 20:05:38
β—‹ 2026-08-09 05:29:22
●NSexpired1.namebrightdns.com2026-07-31 β†’ 2026-08-09 Β· 3 obs
β—‹ 2026-06-03 17:46:20
● 2026-07-31 20:05:38
● 2026-08-09 05:29:22
●NSexpired2.namebrightdns.com2026-07-31 β†’ 2026-08-09 Β· 3 obs
β—‹ 2026-06-03 17:46:20
● 2026-07-31 20:05:38
● 2026-08-09 05:29:22
β—‹NSmelissa.ns.cloudflare.com2026-06-03 β†’ 2026-06-03 Β· 4 obs
β—‹ 2016-09-13 20:43:26
● 2026-06-03 17:46:20
β—‹ 2026-07-31 20:05:38
β—‹ 2026-08-09 05:29:22
β—‹NSns-101.awsdns-12.com2015-06-06 β†’ 2016-09-13 Β· 4 obs
● 2015-06-06 18:29:56
● 2016-09-13 20:43:26
β—‹ 2026-06-03 17:46:20
β—‹ 2026-08-09 05:29:22
β—‹NSns-1257.awsdns-29.org2015-06-06 β†’ 2016-09-13 Β· 4 obs
● 2015-06-06 18:29:56
● 2016-09-13 20:43:26
β—‹ 2026-06-03 17:46:20
β—‹ 2026-08-09 05:29:22
β—‹NSns-1933.awsdns-49.co.uk2015-06-06 β†’ 2016-09-13 Β· 4 obs
● 2015-06-06 18:29:56
● 2016-09-13 20:43:26
β—‹ 2026-06-03 17:46:20
β—‹ 2026-08-09 05:29:22
β—‹NSns-877.awsdns-45.net2015-06-06 β†’ 2016-09-13 Β· 4 obs
● 2015-06-06 18:29:56
● 2016-09-13 20:43:26
β—‹ 2026-06-03 17:46:20
β—‹ 2026-08-09 05:29:22
●NSns1.namebrightdns.com2026-07-31 β†’ 2026-08-09 Β· 3 obs
β—‹ 2026-06-03 17:46:20
● 2026-07-31 20:05:38
● 2026-08-09 05:29:22
●MXmail1.namebrightmail.com2026-07-31 β†’ 2026-08-09 Β· 3 obs
β—‹ 2026-06-03 17:46:20
● 2026-07-31 20:05:38
● 2026-08-09 05:29:22
●MXmail2.namebrightmail.com2026-07-31 β†’ 2026-08-09 Β· 3 obs
β—‹ 2026-06-03 17:46:20
● 2026-07-31 20:05:38
● 2026-08-09 05:29:22
β—‹MXmx.zohomail.com2015-06-06 β†’ 2016-09-13 Β· 4 obs
● 2015-06-06 18:29:56
● 2016-09-13 20:43:26
β—‹ 2026-06-03 17:46:20
β—‹ 2026-08-09 05:29:22
β—‹MXmx2.zohomail.com2015-06-06 β†’ 2016-09-13 Β· 4 obs
● 2015-06-06 18:29:56
● 2016-09-13 20:43:26
β—‹ 2026-06-03 17:46:20
β—‹ 2026-08-09 05:29:22
β—‹A104.21.34.282026-06-03 β†’ 2026-07-30 Β· 19 obs
β—‹ 2016-09-13 20:43:26
● 2026-06-03 17:46:20
β—‹ 2026-06-04 01:21:18
β—‹ 2026-06-10 14:06:36
● 2026-06-11 07:00:58
β—‹ 2026-06-12 14:53:56
● 2026-06-19 07:37:14
β—‹ 2026-06-19 16:06:08
● 2026-06-30 02:26:34
β—‹ 2026-06-30 10:40:36
● 2026-07-07 09:06:12
β—‹ 2026-07-07 13:34:18
● 2026-07-16 05:33:00
β—‹ 2026-07-16 19:06:08
● 2026-07-29 12:00:26
β—‹ 2026-07-29 23:03:20
● 2026-07-30 12:05:36
β—‹ 2026-07-31 00:57:24
β—‹ 2026-08-09 05:29:22
β—‹A172.67.167.2132026-06-03 β†’ 2026-07-30 Β· 19 obs
β—‹ 2016-09-13 20:43:26
● 2026-06-03 17:46:20
β—‹ 2026-06-04 01:21:18
β—‹ 2026-06-10 14:06:36
● 2026-06-11 07:00:58
β—‹ 2026-06-12 14:53:56
● 2026-06-19 07:37:14
β—‹ 2026-06-19 16:06:08
● 2026-06-30 02:26:34
β—‹ 2026-06-30 10:40:36
● 2026-07-07 09:06:12
β—‹ 2026-07-07 13:34:18
● 2026-07-16 05:33:00
β—‹ 2026-07-16 19:06:08
● 2026-07-29 12:00:26
β—‹ 2026-07-29 23:03:20
● 2026-07-30 12:05:36
β—‹ 2026-07-31 00:57:24
β—‹ 2026-08-09 05:29:22
β—‹A188.114.96.02026-06-04 β†’ 2026-07-31 Β· 23 obs
β—‹ 2026-06-03 17:46:20
● 2026-06-04 01:21:18
● 2026-06-10 14:06:36
β—‹ 2026-06-11 07:00:58
● 2026-06-12 14:53:56
β—‹ 2026-06-19 07:37:14
● 2026-06-19 16:06:08
β—‹ 2026-06-30 02:26:34
● 2026-06-30 10:40:36
β—‹ 2026-07-07 09:06:12
● 2026-07-07 13:34:18
β—‹ 2026-07-08 14:25:42
● 2026-07-08 15:01:24
β—‹ 2026-07-16 05:33:00
● 2026-07-16 19:06:08
β—‹ 2026-07-28 05:52:06
● 2026-07-28 07:39:22
β—‹ 2026-07-29 12:00:26
● 2026-07-29 23:03:20
β—‹ 2026-07-30 11:28:12
● 2026-07-31 00:57:24
β—‹ 2026-07-31 20:05:38
β—‹ 2026-08-09 05:29:22
β—‹A188.114.96.42026-07-08 β†’ 2026-07-30 Β· 8 obs
β—‹ 2026-07-07 13:34:18
● 2026-07-08 14:25:42
β—‹ 2026-07-08 15:01:24
● 2026-07-28 05:52:06
β—‹ 2026-07-28 07:39:22
● 2026-07-30 11:28:12
β—‹ 2026-07-30 12:05:36
β—‹ 2026-08-09 05:29:22
β—‹A188.114.97.02026-06-04 β†’ 2026-07-31 Β· 23 obs
β—‹ 2026-06-03 17:46:20
● 2026-06-04 01:21:18
● 2026-06-10 14:06:36
β—‹ 2026-06-11 07:00:58
● 2026-06-12 14:53:56
β—‹ 2026-06-19 07:37:14
● 2026-06-19 16:06:08
β—‹ 2026-06-30 02:26:34
● 2026-06-30 10:40:36
β—‹ 2026-07-07 09:06:12
● 2026-07-07 13:34:18
β—‹ 2026-07-08 14:25:42
● 2026-07-08 15:01:24
β—‹ 2026-07-16 05:33:00
● 2026-07-16 19:06:08
β—‹ 2026-07-28 05:52:06
● 2026-07-28 07:39:22
β—‹ 2026-07-29 12:00:26
● 2026-07-29 23:03:20
β—‹ 2026-07-30 11:28:12
● 2026-07-31 00:57:24
β—‹ 2026-07-31 20:05:38
β—‹ 2026-08-09 05:29:22
β—‹A188.114.97.42026-07-08 β†’ 2026-07-30 Β· 8 obs
β—‹ 2026-07-07 13:34:18
● 2026-07-08 14:25:42
β—‹ 2026-07-08 15:01:24
● 2026-07-28 05:52:06
β—‹ 2026-07-28 07:39:22
● 2026-07-30 11:28:12
β—‹ 2026-07-30 12:05:36
β—‹ 2026-08-09 05:29:22
●A2600:1f18:4ae:c607:5974:bfa8:d54b:7fe52026-07-31 β†’ 2026-08-09 Β· 3 obs
β—‹ 2026-07-31 00:57:24
● 2026-07-31 20:05:38
● 2026-08-09 05:29:22
●A2600:1f18:4ae:c608:1ae1:9fc3:6ee2:84dd2026-07-31 β†’ 2026-08-09 Β· 3 obs
β—‹ 2026-07-31 00:57:24
● 2026-07-31 20:05:38
● 2026-08-09 05:29:22
β—‹A2606:4700:3032::6815:221c2026-06-03 β†’ 2026-06-19 Β· 9 obs
β—‹ 2016-09-13 20:43:26
● 2026-06-03 17:46:20
β—‹ 2026-06-04 01:21:18
β—‹ 2026-06-10 14:06:36
● 2026-06-11 07:00:58
β—‹ 2026-06-12 14:53:56
● 2026-06-19 07:37:14
β—‹ 2026-06-19 16:06:08
β—‹ 2026-08-09 05:29:22
β—‹A2606:4700:3032::ac43:a7d52026-06-30 β†’ 2026-07-30 Β· 12 obs
β—‹ 2026-06-19 16:06:08
● 2026-06-30 02:26:34
β—‹ 2026-06-30 10:40:36
● 2026-07-07 09:06:12
β—‹ 2026-07-07 13:34:18
● 2026-07-16 05:33:00
β—‹ 2026-07-16 19:06:08
● 2026-07-29 12:00:26
β—‹ 2026-07-29 23:03:20
● 2026-07-30 12:05:36
β—‹ 2026-07-31 00:57:24
β—‹ 2026-08-09 05:29:22
β—‹A2606:4700:3034::6815:221c2026-06-30 β†’ 2026-07-30 Β· 12 obs
β—‹ 2026-06-19 16:06:08
● 2026-06-30 02:26:34
β—‹ 2026-06-30 10:40:36
● 2026-07-07 09:06:12
β—‹ 2026-07-07 13:34:18
● 2026-07-16 05:33:00
β—‹ 2026-07-16 19:06:08
● 2026-07-29 12:00:26
β—‹ 2026-07-29 23:03:20
● 2026-07-30 12:05:36
β—‹ 2026-07-31 00:57:24
β—‹ 2026-08-09 05:29:22
β—‹A2606:4700:3036::ac43:a7d52026-06-03 β†’ 2026-06-19 Β· 9 obs
β—‹ 2016-09-13 20:43:26
● 2026-06-03 17:46:20
β—‹ 2026-06-04 01:21:18
β—‹ 2026-06-10 14:06:36
● 2026-06-11 07:00:58
β—‹ 2026-06-12 14:53:56
● 2026-06-19 07:37:14
β—‹ 2026-06-19 16:06:08
β—‹ 2026-08-09 05:29:22
β—‹A2a06:98c1:3120::2026-06-04 β†’ 2026-07-31 Β· 23 obs
β—‹ 2026-06-03 17:46:20
● 2026-06-04 01:21:18
● 2026-06-10 14:06:36
β—‹ 2026-06-11 07:00:58
● 2026-06-12 14:53:56
β—‹ 2026-06-19 07:37:14
● 2026-06-19 16:06:08
β—‹ 2026-06-30 02:26:34
● 2026-06-30 10:40:36
β—‹ 2026-07-07 09:06:12
● 2026-07-07 13:34:18
β—‹ 2026-07-08 14:25:42
● 2026-07-08 15:01:24
β—‹ 2026-07-16 05:33:00
● 2026-07-16 19:06:08
β—‹ 2026-07-18 19:15:10
● 2026-07-19 01:11:10
β—‹ 2026-07-29 12:00:26
● 2026-07-29 23:03:20
β—‹ 2026-07-30 11:28:12
● 2026-07-31 00:57:24
β—‹ 2026-07-31 20:05:38
β—‹ 2026-08-09 05:29:22
β—‹A2a06:98c1:3120::42026-07-08 β†’ 2026-07-30 Β· 8 obs
β—‹ 2026-07-07 13:34:18
● 2026-07-08 14:25:42
β—‹ 2026-07-08 15:01:24
● 2026-07-18 19:15:10
β—‹ 2026-07-19 01:11:10
● 2026-07-30 11:28:12
β—‹ 2026-07-30 12:05:36
β—‹ 2026-08-09 05:29:22
β—‹A2a06:98c1:3121::2026-06-04 β†’ 2026-07-31 Β· 23 obs
β—‹ 2026-06-03 17:46:20
● 2026-06-04 01:21:18
● 2026-06-10 14:06:36
β—‹ 2026-06-11 07:00:58
● 2026-06-12 14:53:56
β—‹ 2026-06-19 07:37:14
● 2026-06-19 16:06:08
β—‹ 2026-06-30 02:26:34
● 2026-06-30 10:40:36
β—‹ 2026-07-07 09:06:12
● 2026-07-07 13:34:18
β—‹ 2026-07-08 14:25:42
● 2026-07-08 15:01:24
β—‹ 2026-07-16 05:33:00
● 2026-07-16 19:06:08
β—‹ 2026-07-18 19:15:10
● 2026-07-19 01:11:10
β—‹ 2026-07-29 12:00:26
● 2026-07-29 23:03:20
β—‹ 2026-07-30 11:28:12
● 2026-07-31 00:57:24
β—‹ 2026-07-31 20:05:38
β—‹ 2026-08-09 05:29:22
β—‹A2a06:98c1:3121::42026-07-08 β†’ 2026-07-30 Β· 8 obs
β—‹ 2026-07-07 13:34:18
● 2026-07-08 14:25:42
β—‹ 2026-07-08 15:01:24
● 2026-07-18 19:15:10
β—‹ 2026-07-19 01:11:10
● 2026-07-30 11:28:12
β—‹ 2026-07-30 12:05:36
β—‹ 2026-08-09 05:29:22
●A44.208.83.1802026-07-31 β†’ 2026-08-09 Β· 3 obs
β—‹ 2026-07-31 00:57:24
● 2026-07-31 20:05:38
● 2026-08-09 05:29:22
β—‹A54.231.160.1472015-06-06 β†’ 2015-06-06 Β· 3 obs
● 2015-06-06 18:29:56
β—‹ 2026-06-03 17:46:20
β—‹ 2026-08-09 05:29:22
β—‹A54.231.161.1872015-06-06 β†’ 2015-06-06 Β· 3 obs
● 2015-06-06 18:29:56
β—‹ 2026-06-03 17:46:20
β—‹ 2026-08-09 05:29:22
β—‹A54.231.162.1232015-10-25 β†’ 2015-10-25 Β· 4 obs
β—‹ 2015-06-06 18:29:56
● 2015-10-25 08:11:32
β—‹ 2016-01-03 02:08:42
β—‹ 2026-08-09 05:29:22
β—‹A54.231.162.352015-06-06 β†’ 2015-06-06 Β· 3 obs
● 2015-06-06 18:29:56
β—‹ 2026-06-03 17:46:20
β—‹ 2026-08-09 05:29:22
β—‹A54.231.162.592015-06-06 β†’ 2015-06-06 Β· 3 obs
● 2015-06-06 18:29:56
β—‹ 2026-06-03 17:46:20
β—‹ 2026-08-09 05:29:22
β—‹A54.231.168.1072015-06-06 β†’ 2015-06-06 Β· 3 obs
● 2015-06-06 18:29:56
β—‹ 2015-10-25 08:11:32
β—‹ 2026-08-09 05:29:22
β—‹A54.231.168.1312015-06-06 β†’ 2015-06-06 Β· 3 obs
● 2015-06-06 18:29:56
β—‹ 2026-06-03 17:46:20
β—‹ 2026-08-09 05:29:22
β—‹A54.231.168.1992016-04-02 β†’ 2016-04-02 Β· 4 obs
β—‹ 2016-01-03 02:08:42
● 2016-04-02 19:26:54
β—‹ 2016-09-13 20:43:26
β—‹ 2026-08-09 05:29:22
β—‹A54.231.168.232015-06-06 β†’ 2015-06-06 Β· 3 obs
● 2015-06-06 18:29:56
β—‹ 2026-06-03 17:46:20
β—‹ 2026-08-09 05:29:22
β—‹A54.231.168.392015-06-06 β†’ 2015-06-06 Β· 3 obs
● 2015-06-06 18:29:56
β—‹ 2026-06-03 17:46:20
β—‹ 2026-08-09 05:29:22
β—‹A54.231.176.1152015-06-06 β†’ 2015-06-06 Β· 3 obs
● 2015-06-06 18:29:56
β—‹ 2026-06-03 17:46:20
β—‹ 2026-08-09 05:29:22
β—‹A54.231.184.272016-01-03 β†’ 2016-01-03 Β· 4 obs
β—‹ 2015-10-25 08:11:32
● 2016-01-03 02:08:42
β—‹ 2016-04-02 19:26:54
β—‹ 2026-08-09 05:29:22
β—‹A54.231.185.432016-09-13 β†’ 2016-09-13 Β· 4 obs
β—‹ 2016-04-02 19:26:54
● 2016-09-13 20:43:26
β—‹ 2026-06-03 17:46:20
β—‹ 2026-08-09 05:29:22
●A54.84.240.2352026-07-31 β†’ 2026-08-09 Β· 3 obs
β—‹ 2026-07-31 00:57:24
● 2026-07-31 20:05:38
● 2026-08-09 05:29:22

πŸ” DNS Trace

πŸ“‹ Delegation Chain

ZoneNameserversGlue
coma.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...-
bitundo.comexpired1.namebrightdns.com, expired2.namebrightdns.com4 records

βœ… Authoritative Response

Server:184.73.13.244

NS records: expired1.namebrightdns.com, expired2.namebrightdns.com

πŸ”’ DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for bitundo.com (unsigned zone)

⏱️ Timing

Total: 189ms | Queries: -

πŸ“„ Records

TypeCountSample Data
A244.208.83.180, 54.84.240.235
AAAA22600:1f18:4ae:c607:5974:bfa8:d54b:7fe5, 2600:1f18:4ae:c608:1ae1:9fc3:6ee2:84dd
NS2expired1.namebrightdns.com, expired2.namebrightdns.com
MX2mail1.namebrightmail.com (pri: 10), mail2.namebrightmail.com (pri: 10)
TXT2google-site-verification=YourUniqueGoogl, v=spf1 a:smtpout1.namebrightmail.com a:s
SOA1ns1.namebrightdns.com dns.namebright.com

πŸ“Œ Glue Records Collected

Total: 4

Out-of-bailiwick: 4 (expired1.namebrightdns.com, expired1.namebrightdns.com, expired2.namebrightdns.com...)

Analysis

Hierarchy

bitundo.com serves as the parent of www.bitundo.com.

IP Addresses

bitundo.com resolves to four IP addresses: 44.208.83.180, 54.84.240.235, 2600:1f18:4ae:c607:5974:bfa8:d54b:7fe5 and 2600:1f18:4ae:c608:1ae1:9fc3:6ee2:84dd.

Two other host names, along with worldeconomictower.com, huvec.com and tamilini.com, also share IP numbers with bitundo.com.

Name Servers

DNS for bitundo.com is handled by three authoritative name servers: expired1.namebrightdns.com, expired2.namebrightdns.com and ns1.namebrightdns.com.

bitundo.com has at least partial name server overlap with other domains, such as uin365.com, fearmore.com, yinhecloud.com and two others.

The name servers nsg1.namebrightdns.com, nsg2.namebrightdns.com, ns2.namebrightdns.com and two others are commonly seen in use alongside these name servers.

Hostnames that map to three IP numbers:

ns1.namebrightdns.com has IP addresses 3.89.42.183, 100.58.124.42 and 2600:1f18:683a:ae1a:c41d:b4cf:322b:2aa6.

Host names that have two IP addresses:

expired1.namebrightdns.com has two IP addresses: 3.90.47.36 and 2600:1f18:683a:ae1a:b0bf:3f0f:12cd:e9b5.

expired2.namebrightdns.com has two IP addresses: 184.73.13.244 and 2600:1f18:683a:ae1b:80e1:c13b:b873:a981.

Mail Servers

bitundo.com is served by two mail servers, mail1.namebrightmail.com and mail2.namebrightmail.com.

Among the domains sharing a mail server setup with bitundo.com are goalkeepersanonymous.com, macktube.com, netmarkafrica.org and two others.

mail1.namebrightmail.com directs to 66.35.35.26 and mail2.namebrightmail.com directs to 66.35.35.28; each host name points to exactly one IP number.