cisco.com

Summary

Registrar

MarkMonitor Inc.

Status

clientDeleteProhibited

Created on

May 14, 1987

Expires on

May 15, 2027

Name servers

a3-64.akam.net, ns2.cisco.com, ns1.cisco.com, ns3.cisco.com, a28-64.akam.net

Mail servers

alln-mx-01.cisco.com, rcdn-mx-01.cisco.com, aer-mx-01.cisco.com

DMARC

Reject

SPF

Delegated

DKIM

8 keys found

Website

See the website

Spoofing protection (DMARC)

DMARC tells mail servers what to do with an e-mail that claims to come from cisco.com but fails SPF and DKIM checks.

Policy

Reject

Subdomain policy

Reject

Messages covered

100%

DKIM alignment

Relaxed

SPF alignment

Relaxed

Aggregate reports

[email protected]

Failure reports

[email protected]

Record

v=DMARC1; p=reject; pct=100; sp=reject; fo=1; ri=3600; rua=mailto:[email protected]; ruf=mailto:[email protected];

Authorized senders (SPF)

SPF lists the servers allowed to send e-mails for cisco.com.

v=spf1 redirect=spfa._spf.cisco.com

E-mail signing (DKIM)

DKIM keys published by cisco.com under the most common selectors. Other keys may exist under selectors specific to each sending service.

RSA keys shorter than 2048 bits, called short keys, are discouraged: they are easier to break.

MX, SPF, DKIM and DMARC: the e-mail records

Four DNS records make a domain's e-mail work. MX says where e-mails sent to cisco.com arrive; SPF, DKIM and DMARC let mail servers check that an e-mail claiming to come from cisco.com was really sent by this domain, which protects it against spoofing.

cisco.com  MX  10 mx1.cisco.com.
cisco.com  MX  20 mx2.cisco.com.

cisco.com  TXT  "v=spf1 mx include:_spf.google.com ip4:192.0.2.10 -all"

google._domainkey.cisco.com  TXT  "v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA…"

_dmarc.cisco.com  TXT  "v=DMARC1; p=quarantine; rua=mailto:[email protected]; adkim=r; aspf=r"

DNS records of cisco.com

Related IP addresses

IPv4 addresses used by cisco.com: website, name servers, mail servers and senders authorized by SPF.

WHOIS of the domain cisco.com

Domain Name: CISCO.COM
   Registry Domain ID: 4987030_DOMAIN_COM-VRSN
   Registrar WHOIS Server: whois.markmonitor.com
   Registrar URL: http://www.markmonitor.com
   Updated Date: 2026-04-13T09:54:02Z
   Creation Date: 1987-05-14T04:00:00Z
   Registry Expiry Date: 2027-05-15T04:00:00Z
   Registrar: MarkMonitor Inc.
   Registrar IANA ID: 292
   Registrar Abuse Contact Email: [email protected]
   Registrar Abuse Contact Phone: +1.2086851750
   Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
   Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
   Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited
   Domain Status: serverDeleteProhibited https://icann.org/epp#serverDeleteProhibited
   Domain Status: serverTransferProhibited https://icann.org/epp#serverTransferProhibited
   Domain Status: serverUpdateProhibited https://icann.org/epp#serverUpdateProhibited
   Name Server: A28-64.AKAM.NET
   Name Server: A3-64.AKAM.NET
   Name Server: NS1.CISCO.COM
   Name Server: NS2.CISCO.COM
   Name Server: NS3.CISCO.COM
   DNSSEC: unsigned
   URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2026-10-01T15:48:58Z <<<

For more information on Whois status codes, please visit https://icann.org/epp

NOTICE: The expiration date displayed in this record is the date the
registrar's sponsorship of the domain name registration in the registry is
currently set to expire. This date does not necessarily reflect the expiration
date of the domain name registrant's agreement with the sponsoring
registrar.  Users may consult the sponsoring registrar's Whois database to
view the registrar's reported date of expiration for this registration.

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