comcast.com

Summary

Registrar

CSC Corporate Domains, Inc.

Status

clientTransferProhibited

Created on

August 29, 1995

Expires on

August 28, 2027

Name servers

dns105.comcast.net, dns104.comcast.net, dns101.comcast.net, dns102.comcast.net, dns103.comcast.net

Mail servers

mxa-00143702.gslb.pphosted.com, mxb-00143702.gslb.pphosted.com

DMARC

Reject

SPF

Soft

DKIM

7 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 comcast.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], [email protected]

Failure reports

[email protected]

Record

v=DMARC1;p=reject;fo=1;rua=mailto:[email protected],mailto:[email protected];ruf=mailto:[email protected]

Authorized senders (SPF)

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

v=spf1 ip4:148.163.145.77 ip4:148.163.141.77 ip4:162.150.44.71 ip4:96.114.158.212 ip4:68.87.31.167 ip4:68.87.96.15 ip4:96.114.28.75 ip4:96.114.28.76 ip4:67.231.157.49 ip4:67.231.149.53 ip4:192.28.144.202 include:spfext.zapproved.com include:_spf.mdp.comcast.net include:_spf.comcast.com include:spf-00143705.pphosted.com ~all

E-mail signing (DKIM)

DKIM keys published by comcast.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 comcast.com arrive; SPF, DKIM and DMARC let mail servers check that an e-mail claiming to come from comcast.com was really sent by this domain, which protects it against spoofing.

comcast.com  MX  10 mx1.comcast.com.
comcast.com  MX  20 mx2.comcast.com.

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

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

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

DNS records of comcast.com

Related IP addresses

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

WHOIS of the domain comcast.com

Domain Name: COMCAST.COM
   Registry Domain ID: 3477270_DOMAIN_COM-VRSN
   Registrar WHOIS Server: whois.corporatedomains.com
   Registrar URL: http://cscdbs.com
   Updated Date: 2026-08-24T05:16:07Z
   Creation Date: 1995-08-29T04:00:00Z
   Registry Expiry Date: 2027-08-28T04:00:00Z
   Registrar: CSC Corporate Domains, Inc.
   Registrar IANA ID: 299
   Registrar Abuse Contact Email: [email protected]
   Registrar Abuse Contact Phone: 8887802723
   Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
   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: DNS101.COMCAST.NET
   Name Server: DNS102.COMCAST.NET
   Name Server: DNS103.COMCAST.NET
   Name Server: DNS104.COMCAST.NET
   Name Server: DNS105.COMCAST.NET
   DNSSEC: signedDelegation
   DNSSEC DS Data: 9764 13 2 705C2E769020C2AA0583D5AC58D410BF0714ABA694C5C07D372315842273D028
   URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2026-09-30T22:13:58Z <<<

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
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view the registrar's reported date of expiration for this registration.

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