cisco.com - robtex.com
cisco.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 2001:420:1101:1::185🇺🇸 ASNTTCISCO2001:420:1100::/41 170 West Tasman Drive San Jose CA 95134 United States | ||||||
| A | 72.163.4.185🇺🇸 ASNTTCISCO72.163.4.0/24 170 West Tasman Drive San Jose CA 95134 United States | ||||||
| NS | ns1.cisco.com ⭐ | ||||||
| A | 2001:420:1101:6::a🇺🇸 ASNTTCISCO2001:420:1100::/41 170 West Tasman Drive San Jose CA 95134 United States | ||||||
| PTR | ns1.cisco.com | ||||||
| A | 72.163.5.201🇺🇸 ASNTTCISCO72.163.0.0/18 170 West Tasman Drive San Jose CA 95134 United States | ||||||
| PTR | ns1.cisco.com | ||||||
| NS | a28-64.akam.net | ||||||
| A | 2600:1480:d800::40🇺🇸 Akamai2600:1480:d800::/48 Technologies | ||||||
| PTR | a28-64.akam.net | ||||||
| A | 95.100.173.64🇳🇱 Akamai95.100.173.0/24 Technologies | ||||||
| PTR | a28-64.akam.net | ||||||
| PTR | eur2.akam.net | ||||||
| NS | a3-64.akam.net | ||||||
| A | 2600:1408:1c::40🇺🇸 Akamai2600:1408:1c::/48 Technologies | ||||||
| PTR | a3-64.akam.net | ||||||
| PTR | ns7-64.akam.net | ||||||
| A | 96.7.49.64🇺🇸 Akamai96.7.49.0/24 Technologies | ||||||
| NS | ns2.cisco.com | ||||||
| A | 2001:420:2041:5000::a🇺🇸 ASNTTCISCO2001:420:2000::/35 170 West Tasman Drive San Jose CA 95134 United States | ||||||
| PTR | ns2.cisco.com | ||||||
| A | 64.102.255.44🇺🇸 ASNTTCISCO64.102.0.0/16 170 West Tasman Drive San Jose CA 95134 United States | ||||||
| PTR | ns2.cisco.com | ||||||
| NS | ns3.cisco.com | ||||||
| A | 2001:420:1201:7::a🇺🇸 ASNTTCISCO2001:420:1200::/41 170 West Tasman Drive San Jose CA 95134 United States | ||||||
| PTR | ns3.cisco.com | ||||||
| A | 173.37.146.41🇺🇸 ASNTTCISCO173.37.128.0/19 170 West Tasman Drive San Jose CA 95134 United States | ||||||
| PTR | ns3.cisco.com | ||||||
| MX | alln-mx-01.cisco.com ⭐ | ||||||
| A | 2001:420:1201:6::ad25:93e6🇺🇸 ASNTTCISCO2001:420:1200::/41 170 West Tasman Drive San Jose CA 95134 United States | ||||||
| PTR | alln-mx-01.cisco.com | ||||||
| A | 173.37.147.230🇺🇸 ASNTTCISCO173.37.128.0/19 170 West Tasman Drive San Jose CA 95134 United States | ||||||
| PTR | alln-mx-01.cisco.com | ||||||
| MX | rcdn-mx-01.cisco.com(20) | ||||||
| A | 2001:420:1101:7::48a3:166🇺🇸 ASNTTCISCO2001:420:1100::/41 170 West Tasman Drive San Jose CA 95134 United States | ||||||
| PTR | rcdn-mx-01.cisco.com | ||||||
| A | 72.163.7.166🇺🇸 ASNTTCISCO72.163.7.0/24 170 West Tasman Drive San Jose CA 95134 United States | ||||||
| PTR | rcdn-mx-01.cisco.com | ||||||
| MX | aer-mx-01.cisco.com(30) | ||||||
| A | 2001:420:4621::ad26:d496🇳🇱 ASNTTCISCO2001:420:4000::/36 170 West Tasman Drive San Jose CA 95134 United States | ||||||
| PTR | aer-mx-01.cisco.com | ||||||
| A | 173.38.212.150🇳🇱 ASNTTCISCO173.38.128.0/17 170 West Tasman Drive San Jose CA 95134 United States | ||||||
| PTR | aer-mx-01.cisco.com | ||||||
| TXT | docker-verification=4c56633a-274e-4858-88a2-2aeceffcfd66 | ||||||
| TXT | apple-domain-verification=qOInipPgso3W8cmK | ||||||
| TXT | amazonses:7LyiKZmpuGja4+KbA4xX3lN69yajYKLkHH4QJcWnuwo= | ||||||
| TXT | duo_sso_verification=AxenLdoqIXzjl2RJzE1BlOfkawDbDFlnbyvjAt8vcjKHBkvYwEMySDRk... | ||||||
| TXT | stripe-verification=8e54fae7680b23aad6d5e3417be73a043f7e45cd2767272dbe0c9c6ea... | ||||||
| TXT | airtable-verification=d95d028f039252314cb7507fb88e4317 | ||||||
| TXT | ZOOM_verify_Gf6CaEdJ5aKGvjcUrZRkiA | ||||||
| TXT | adobe-aem-verification=www-devint-cloud.cisco.com/24859/366173/9418f2a2-ef45-... | ||||||
| TXT | twilio-domain-verification=268434bd6a91bdd8d3bb5e6cffeeace7 | ||||||
| TXT | airtable-verification=18787f2dc47697bb547e871772aba0be | ||||||
| TXT | google-site-verification=V3t2K3dvr9fcd1YWwwanSmebEOO_UNTP06HR2_gUO5M | ||||||
| TXT | google-site-verification=9MlQU9MMQ1jHLMUkONKe6QzZ-ZIGRv0BCD1_rY1Zdmc | ||||||
| TXT | atlassian-domain-verification=UwP1ncfiphlFs+wRx8wIBSXDScwNL7Jrw7tq2rnYz3+9T5+... | ||||||
| TXT | atlassian-domain-verification=672RcADvt8BPqsb9gCN2ZC5DoTAhUT8abC1blYKQxi/MHMa... | ||||||
| TXT | mZvHszGlmDhvPOUKL+6JMiw/VtckyOMKjcw1PLcjYowxM2PVLX2xG0ZSgdHRm8HXfaaGR2pMvhIrB... | ||||||
| TXT | stripe-verification=2B4F3B35976CFB93CA884A90BF3E0A8873EAC7C5AFD06D7047E87B794... | ||||||
| TXT | OSSRH-97236 | ||||||
| TXT | miro-verification=53bf5ccd47cb6239fe5cf14c3b328050dd5679ac | ||||||
| TXT | MS=ms35724259 | ||||||
| TXT | twilio-domain-verification=3b5f92478e8c38980a265e599e1538c8 | ||||||
| TXT | facebook-domain-verification=1zoxo8z7t013gpruxmhc8dkerq47vh | ||||||
| TXT | amazonses:mX+ylQj+fJAfh9pr03yIR7YvjKZ1bOo5ABegqM/5pvI= | ||||||
| TXT | fastly-domain-delegation-z9slsbDdX0-368365-2021-05-14 | ||||||
| TXT | fastly-domain-delegation-w049tcm0w48ds-341317-20210209 | ||||||
| TXT | duo_sso_verification=pG21Oj5OPCxRPsWXsfbauWT9oua82cKtYUPAmsQvovKNq3xqWEcsEMEA... | ||||||
| TXT | asv=ac90e11808e87cfbf8768e69819b1aca | ||||||
| TXT | intercom-domain-validation=8806e2f9-7626-4d9e-ae4d-2d655028629a | ||||||
| TXT | notion-domain-verification=7sz4S3LLtNIHZpYsgTTgOcRLlLrJ5JrmIgVcdRtGi1X | ||||||
| TXT | docusign=5e18de8e-36d0-4a8e-8e88-b7803423fa2f | ||||||
| TXT | airtable-verification=8bf444fd0fad14a3aae2681cb7d68641 | ||||||
| TXT | stripe-verification=0BAD851A6A7ACC4A12DDCE03460CCEFAC86320A8494FDCCED35F71EE2... | ||||||
| TXT | hubspot-domain-verification=NDQzNGY2ZWEtZTY0ZC00ZDQyLWI4YzctOGRkNDVjNTQ4YTAx | ||||||
| TXT | flexera-domain-verification-nsbtshbvpbsmbnzh | ||||||
| TXT | jetbrains-domain-verification=e9mcf886rjng68x4qu59h22ef | ||||||
| TXT | bfefecbd-d5df-4b3a-b0dd-54bf5c72e698 | ||||||
| TXT | airtable-verification=c0b5bd3f3db736f775f0dbe4e103cdea | ||||||
| TXT | flexera-domain-verification-oxonqwdadtkprrcn | ||||||
| TXT | yahoo-verification-key=2B33D2zyxdBOxUw/abowAuwQ2pdtznP6ULDfQC3ag2g= | ||||||
| TXT | elevenlabs=X_8Xi7v2hC20yVbziZuWtkapfDzUtNK3BogfZKVe9gY | ||||||
| TXT | sending_domain1067842=8806a83586b0389c05457f8b2f06e4859b3f1b0d6bad52e5fee552b... | ||||||
| TXT | airtable-verification=606530d538d1833c5fc724117ca5409a | ||||||
| TXT | h1-domain-verification=rix5vuxntVpma4rTL2DbE3FDrrPjedhnRaqaHvghyod3egmZ | ||||||
| TXT | airtable-verification=4114c0f710cfc430d841e55ed7ed920d | ||||||
| TXT | 926723159-3188410 | ||||||
| TXT | docusign=95052c5f-a421-4594-9227-02ad2d86dfbe | ||||||
| TXT | duo_sso_verification=6Q7pJwSZ3damWHBcB8TNd9I5oduLRAFDDhip2pTFaa3QoIZtZnCgzjyZ... | ||||||
| TXT | v=spf1 redirect=spfa._spf.cisco.com | ||||||
| TXT | pendo-domain-verification=5995ba9c-9bf8-43d8-9e5a-309856760011 | ||||||
| TXT | mixpanel-domain-verify=2c6cb1aa-a3fb-44b9-ad10-d6b744109963 | ||||||
| TXT | airtable-verification=8cd8b684d3d85964f2769dcb89944501 | ||||||
| TXT | SFMC-o7HX74BQ79k7glpt_qjlF2vmZO9DpqLtYxKLwg87 | ||||||
| TXT | profound-domain-verification-4tbqdv=dgW9PRoomrumTvr2gfRW4H3B1 | ||||||
| TXT | pendo-domain-verification=c9796502-c914-4e50-892d-e426f2ac68e9 | ||||||
| TXT | ms-domain-verification=e0289fac-4a94-41df-b2b0-794347e490b7 | ||||||
| TXT | _v91byogpqpkdt9giz9d119ldke45oos | ||||||
| TXT | cloudflare_dashboard_sso=f60a7d128e406b8d9dd4103dd3554f6b | ||||||
| TXT | airtable-verification=d886631ce96b77ba775f9bddab44df92 | ||||||
| TXT | atlassian-domain-verification=7JYRlY9ijBijTJ0YS5a8/58DU7OfKAHMYRufcy0TC57j2mN... | ||||||
| TXT | pendo-domain-verification=c9d2fba1-7d94-4cf9-a6fb-310883c8bb15 | ||||||
| TXT | cursor-domain-verification-evn8nj=Ml5OeQYe3sBg8uZOIeRrJgCO7 | ||||||
| TXT | fastly-domain-delegation-e9a758d22183504af2d5ab4d9a9853da-20210127 | ||||||
| TXT | pendo-domain-verification=Ad800_b0VJCaE7Ued9Ug3pIQ_V4 | ||||||
| TXT | atlassian-domain-verification=AYTzL6wSVsW0IdyQp7gwv6lwtHdpMATnb8QriqyJ0niAaZc... | ||||||
| TXT | google-site-verification=WmdDuSXl3PMb-48qcY6VUbW9kzNPe46zn9uDwgB2wX0 | ||||||
| TXT | notion-domain-verification=IsKmFIvIIP8RUQNn4ZGQjzuCdZnI7TY7xcIYb65QQE8 | ||||||
| TXT | postman-domain-verification=bac0835520fcf3b408c07c584b3575452de5930d08a942cc0... | ||||||
| TXT | c900335b8b825859b51473b9943a3880ae795df47426483b0a67630377a902f5 | ||||||
| TXT | google-site-verification=qPS9ZkoQ-Og1rBrM1_N7z-tNJNy2BVxE8lw6SB2iFdk | ||||||
| TXT | workplace-domain-verification=Uhv7QPQ22nbuD3vG0jspf7R6LruYoS | ||||||
| TXT | fastly-domain-delegation-im0VCGY5X0axEEmhXJb2-347911-20210310 | ||||||
| TXT | google-site-verification=r-K1CIdXkgRWxZstUHtVyM2UfwflnGgr4AR9_Qhk28Q | ||||||
| TXT | google-site-verification=DN8r8LEcNiPYD95x3VnUM7Q6BH2H3390qvdIy4QjpvU | ||||||
| TXT | identrust_validate=mPh/vaMx5zgF8r1udSDOH2z2cf4O8bIcuPgHIigCFbxs | ||||||
| TXT | jamf-site-verification=0mwRCzzRvk_HiKjmiqR3Lw | ||||||
| TXT | amazonses:QbUv5pPHGQxRy1vKA0J7Y/biE9oR6MTxOTI1bZIfjsw= | ||||||
| TXT | sending_domain731003=25e34fadea88da7e64f0fab1e32d094f1f1e0fb2b97622deac2521f7... | ||||||
| TXT | duo_sso_verification=sKMGaTln2vmQuKwaE4hKtTEY1UYn2JzAaxSZzGjkgJrKuZChN344mhIp... | ||||||
| TXT | duo_sso_verification=IYdVUIrb2L95JVejSXV3hfsJVDZolQKKOPBztlD6TIgfCRSKeMuf8Wgb... | ||||||
| TXT | google-site-verification=lW5eqPMJI4VrLc28YW-JBkqA-FDNVnhFCXQVDvFqZTo | ||||||
| TXT | QuoVadis=94d4ae74-ecd5-4a33-975e-a0d7f546c801 | ||||||
| TXT | adobe-idp-site-verification=c900335b8b825859b51473b9943a3880ae795df47426483b0... | ||||||
| TXT | facebook-domain-verification=qr2nigspzrpa96j1nd9criovuuwino | ||||||
| TXT | atlassian-domain-verification=2ldosmg0o2Mhpyok1OISaSGygWU9zk6fLLWdoczXtHap9lu... | ||||||
| TXT | adobe-aem-verification=www-idev-cloud.cisco.com/24859/366204/1b990ef7-ff88-49... | ||||||
| TXT | anthropic-domain-verification-5dyq28=xkpw44itymPv0HXOvUdry99zb | ||||||
| TXT | google-site-verification=Vc0Pir22m1u9yw5HjXf6TYO6rlAI9EY8IVKUma-OqDY | ||||||
| TXT | atlassian-domain-verification=Gt2demeKDLmtNc9kPZhaAHFA37DEIcmFGUd6LARvB4yjLG7... | ||||||
| TXT | wiz-domain-verification=af241e6396696eedf1b361891435f6b21bdebb5621941d9927929... | ||||||
| SOA | ns1.cisco.compostmaster@cisco.com serial=1262809 | ||||||
com
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.gtld-servers.net ⭐ | ||||||
| NS | b.gtld-servers.net | ||||||
| NS | c.gtld-servers.net | ||||||
| NS | d.gtld-servers.net | ||||||
| NS | e.gtld-servers.net | ||||||
| NS | f.gtld-servers.net | ||||||
| NS | g.gtld-servers.net | ||||||
| NS | h.gtld-servers.net | ||||||
| NS | i.gtld-servers.net | ||||||
| NS | j.gtld-servers.net | ||||||
| NS | k.gtld-servers.net | ||||||
| NS | l.gtld-servers.net | ||||||
| NS | m.gtld-servers.net | ||||||
| SOA | a.gtld-servers.netnstld@verisign-grs.com serial=1786600209 | ||||||
rank #198 in the tld
cisco.com
cisco.comis the official corporate website of Cisco Systems, Inc., a major multinational technology conglomerate that designs and sells networking hardware, software, and telecommunications equipment. It is one of the oldest registered domains on the internet.
Key facts
- Owner / operator: Cisco Systems, Inc.
- TLD:
.com— gTLD - Primary purpose: corporate website
- Status: active
History
| Year | Event |
|---|---|
| 1987 | The domain namecisco.comis registered by Cisco Systems on May 14. |
| 1992 | Cisco launches "Cisco Information Online" (CIO), its first online service (via Telnet and modem), providing text-based technical resources. |
| 1996 | Cisco introduces e-commerce features on "Cisco Connection Online" (CCO), allowing customers to configure and purchase products directly oncisco.com. |
WOT: SAFE (92/100)
📈 Tranco rank: #246
Cisco Systems is a multinational technology company founded in 1984, dominating the network infrastructure market. Cisco's routers and switches form the backbone of the internet and enterprise networks globally, with annual revenue exceeding $50 billion.
Cisco's portfolio includes networking hardware, security solutions, collaboration tools (Webex), and cloud services. The company has made numerous acquisitions including Webex, AppDynamics, and Duo Security.
Cisco's infrastructure supports massive global operations including Webex video conferencing serving millions of meetings daily.
DNS for cisco.com uses a hybrid setup with multiple providers for global resilience appropriate for a networking company.
Subdomains
Same first word
Similar names
DNS History
15 records (10 active, 5 former)
●NSa28-64.akam.net2026-02-14 → 2026-08-13 · 6 obs
● 2026-02-14 17:50:24
● 2026-03-27 15:59:26
○ 2026-03-27 16:34:56
● 2026-03-27 17:12:38
● 2026-08-13 05:54:26
●NSa3-64.akam.net2026-02-14 → 2026-08-13 · 6 obs
● 2026-02-14 17:50:24
● 2026-03-27 15:59:26
○ 2026-03-27 16:34:56
● 2026-03-27 17:12:38
● 2026-08-13 05:54:26
○NSedns-aln1-1-l2016-08-17 → 2017-01-06 · 12 obs
● 2016-08-17 11:44:40
● 2016-12-21 21:06:38
○ 2016-12-23 09:35:54
○ 2016-12-24 14:45:54
● 2016-12-27 07:56:12
● 2016-12-30 01:22:14
○ 2016-12-31 08:56:58
● 2017-01-04 22:19:44
● 2017-01-06 10:12:04
○ 2017-01-10 13:44:04
○ 2026-08-13 05:54:26
○NSedns-aln1-1-l.cisco.com2015-09-03 → 2016-08-09 · 21 obs
● 2015-10-28 12:49:16
○ 2015-10-29 15:18:56
● 2015-10-30 21:45:52
● 2015-11-24 14:26:42
○ 2015-11-25 17:42:16
● 2015-11-27 19:44:22
● 2015-12-03 10:04:14
○ 2015-12-07 08:48:04
● 2015-12-08 18:04:52
● 2016-01-20 12:58:56
○ 2016-01-22 20:47:00
● 2016-01-24 10:09:44
○ 2016-01-27 18:38:46
● 2016-01-29 19:58:32
● 2016-03-16 16:43:18
○ 2016-03-19 07:05:02
● 2016-03-20 22:50:56
● 2016-08-09 13:41:00
○ 2016-08-17 11:44:40
○ 2026-08-13 05:54:26
○NSedns-rtp5-1-l2015-10-29 → 2016-12-31 · 25 obs
● 2015-10-29 15:18:56
○ 2015-10-30 21:45:52
○ 2015-11-24 14:26:42
● 2015-11-25 17:42:16
○ 2015-11-27 19:44:22
○ 2015-12-03 10:04:14
● 2015-12-07 08:48:04
○ 2015-12-08 18:04:52
○ 2016-01-20 12:58:56
● 2016-01-22 20:47:00
○ 2016-01-24 10:09:44
● 2016-01-27 18:38:46
○ 2016-01-29 19:58:32
○ 2016-03-16 16:43:18
● 2016-03-19 07:05:02
○ 2016-03-20 22:50:56
○ 2016-12-21 21:06:38
● 2016-12-23 09:35:54
● 2016-12-24 14:45:54
○ 2016-12-27 07:56:12
○ 2016-12-30 01:22:14
● 2016-12-31 08:56:58
○ 2017-01-04 22:19:44
○ 2026-08-13 05:54:26
●NSns1.cisco.com2015-09-03 → 2026-08-13 · 5 obs
● 2026-03-27 15:59:26
○ 2026-03-27 16:34:56
● 2026-03-27 17:12:38
● 2026-08-13 05:54:26
●NSns2.cisco.com2015-09-03 → 2026-08-13 · 5 obs
● 2026-03-27 15:59:26
○ 2026-03-27 16:34:56
● 2026-03-27 17:12:38
● 2026-08-13 05:54:26
●NSns3.cisco.com2015-09-03 → 2026-08-13 · 5 obs
● 2026-03-27 15:59:26
○ 2026-03-27 16:34:56
● 2026-03-27 17:12:38
● 2026-08-13 05:54:26
●MXaer-mx-01.cisco.com2015-09-03 → 2026-08-13 · 5 obs
● 2026-03-27 15:59:26
○ 2026-03-27 16:34:56
● 2026-03-27 17:12:38
● 2026-08-13 05:54:26
●MXalln-mx-01.cisco.com2015-09-03 → 2026-08-13 · 5 obs
● 2026-03-27 15:59:26
○ 2026-03-27 16:34:56
● 2026-03-27 17:12:38
● 2026-08-13 05:54:26
●MXrcdn-mx-01.cisco.com2015-09-03 → 2026-08-13 · 5 obs
● 2026-03-27 15:59:26
○ 2026-03-27 16:34:56
● 2026-03-27 17:12:38
● 2026-08-13 05:54:26
●A2001:420:1101:1::1852017-12-23 → 2026-08-13 · 6 obs
● 2017-12-23 12:08:50
● 2026-03-27 15:59:26
○ 2026-03-27 16:34:56
● 2026-03-27 17:12:38
● 2026-08-13 05:54:26
○A2001:420:1101:1::a2015-09-03 → 2017-11-28 · 4 obs
● 2017-11-28 19:29:58
○ 2017-12-23 12:08:50
○ 2026-08-13 05:54:26
○A72.163.4.1612015-09-03 → 2017-11-28 · 4 obs
● 2017-11-28 19:29:58
○ 2017-12-23 12:08:50
○ 2026-08-13 05:54:26
●A72.163.4.1852017-12-23 → 2026-08-13 · 9 obs
● 2017-12-23 12:08:50
● 2026-03-27 15:59:26
○ 2026-03-27 16:34:56
● 2026-03-27 17:12:38
● 2026-04-05 00:52:32
○ 2026-04-05 02:38:08
● 2026-04-05 03:38:52
● 2026-08-13 05:54:26
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| cisco.com | ns1.cisco.com, ns2.cisco.com, a3-64.akam.net, a28-64.akam.net... | 6 records |
✅ Authoritative Response
Server:72.163.5.201
NS records: ns1.cisco.com, ns2.cisco.com, a3-64.akam.net, a28-64.akam.net, ns3.cisco.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for cisco.com (unsigned zone)
⏱️ Timing
Total: 522ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 72.163.4.185 |
| AAAA | 1 | 2001:420:1101:1::185 |
| NS | 5 | ns2.cisco.com, a28-64.akam.net... |
| MX | 3 | alln-mx-01.cisco.com (pri: 10), rcdn-mx-01.cisco.com (pri: 20)... |
| TXT | 88 | jetbrains-domain-verification=e9mcf886rj, adobe-aem-verification=www-idev-cloud.ci... |
| SOA | 1 | ns1.cisco.com postmaster.cisco.com |
📌 Glue Records Collected
Total: 6
In-bailiwick: 6 (ns1.cisco.com, ns1.cisco.com, ns2.cisco.com...)
Related
Analysis
Hierarchy
The parent domain cisco.com covers itevents-sng.cisco.com, bangalore-vpn-cluster.cisco.com, plateau-dev-app1.cisco.com, dmvpn-pod2.cisco.com, dhcp-ams5-vlan250-wdata-144-254-201-8.cisco.com and several thousand other host names.
IP Addresses
cisco.com points to the IP addresses 72.163.4.185 and 2001:420:1101:1::185
Other hosts including cisco.zip, redirect-ns.cisco.com and ipv6.cisco.com share IP addresses with cisco.com.
Name Servers
cisco.com has five name servers, which are ns1.cisco.com, ns2.cisco.com, ns3.cisco.com and two others.
There is at least partial name server overlap between cisco.com and other domains — is.astellas.com, harrisnesbittgerard.org, hundm.net and two more among them.
These name servers regularly appear alongside a28-64.akam.net, a3-64.akam.net, a11-66.akam.net and 4 other name servers in NS record sets.
Hostnames that resolve to two IP addresses:
ns1.cisco.com resolves to two addresses: 72.163.5.201 and 2001:420:1101:6::a.
ns2.cisco.com resolves to two addresses: 64.102.255.44 and 2001:420:2041:5000::a.
ns3.cisco.com resolves to two addresses: 173.37.146.41 and 2001:420:1201:7::a.
a28-64.akam.net resolves to two addresses: 95.100.173.64 and 2600:1480:d800::40.
a3-64.akam.net resolves to two addresses: 96.7.49.64 and 2600:1408:1c::40.
Mail Servers
Incoming mail for cisco.com is delivered via three mail servers: aer-mx-01.cisco.com, alln-mx-01.cisco.com and rcdn-mx-01.cisco.com.
cisco.com has at least partial mail server overlap with other domains such as greenfieldnetworks.com, vcider.com, theflip.com and two more.
These mail servers are routinely found in combination with the mail servers mail1.dynamicsoft.com, mail.topspin.com and smtp15.msoutlookonline.net.
aer-mx-01.cisco.com, alln-mx-01.cisco.com and rcdn-mx-01.cisco.com are three hostnames that each resolve to a pair of IP addresses: aer-mx-01.cisco.com to 173.38.212.150 and 2001:420:4621::ad26:d496, alln-mx-01.cisco.com to 173.37.147.230 and 2001:420:1201:6::ad25:93e6, and rcdn-mx-01.cisco.com to 72.163.7.166 and 2001:420:1101:7::48a3:166.