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Total

DNS

Email

Security

Network

Availability

Domaincomcast.com

IPv41

IPv60

MX records2

StatusActive

Domain technical report

comcast.com

Generated: 2026-08-09T09:19:20-05:00 · Cached result

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IPv41

IPv60

MX2

NS5

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

1 IPv4 address(es) detected.

IPv6 (AAAA)0 / 10 pts · Dns

0 IPv6 address(es) detected.

✓

Name server redundancy20 / 20 pts · Dns

5 NS record(s); 2 or more required.

✓

SOA record10 / 10 pts · Dns

Authoritative zone record.

✓

DNSSEC chain15 / 15 pts · Dns

DS and DNSKEY detected.

CAA policy0 / 5 pts · Dns

Certificate authority restriction.

✓

DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓

MX records20 / 20 pts · Mail

2 MX record(s).

✓

SPF25 / 25 pts · Mail

SPF policy published.

✓

DMARC25 / 25 pts · Mail

DMARC policy published.

✓

DKIM20 / 20 pts · Mail

A DKIM selector was verified.

MTA-STS0 / 5 pts · Mail

Mail transport policy.

TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

Valid TLS certificate0 / 55 pts · Security

No valid certificate was retrieved.

Certificate lifetime0 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers0 / 35 pts · Security

0 of 9 evaluated headers detected.

✓

PTR reverse DNS30 / 30 pts · Network

PTR: dns-upper-redirect.xfinity.com

IPv4 diversity20 / 35 pts · Network

Two or more IPv4 addresses receive full points.

IPv6 connectivity0 / 35 pts · Network

AAAA availability.

✓

DNS resolution40 / 40 pts · Availability

At least one address family must resolve.

HTTP response0 / 40 pts · Availability

No successful HTTP response.

✓

HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)

96.99.227.0

AAAA

0 record(s)

—

Not configured

CNAME

0 record(s)

—

Not configured

MX

2 record(s)

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

TXT

38 record(s)

"apple-domain-verification=VNdTgwsxrDHE4eJM"
"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"
"docker-verification=f79a60d9-69ec-4c26-8d54-0165c0943613"
"airtable-verification=d9386eea22fce5ee0d01209512aa7706"
"atlassian-domain-verification=xhDGO0SgEPXcuSpqqvu7kAzZyKrM2pat53VPEt5XvKGHvOq4ErhUFRioLG98Ndh3"
"facebook-domain-verification=f1zw72g52fjiesmld6xtuj467pl7f5"
"al0yn+08kj3q/n1E+s02ttnE5Fd9gIjwjjbn4mCggizGLJepyQ7cMxRTgw4RxYVoZ965qJIHfnH0966SxaicMw=="
"apple-domain-verification=XRKeuEf5cWtc2oDC"
"1password-site-verification=3BCX5ACVKBD73ADOMJ5XWM7JJ4"
"vertexinc-cloud-208b00fd-6b0a-43ae-8e00-1ee7ab817d66"
"docusign=0ead29a6-1c9c-4b0c-865a-85a5a127e776"
"paloaltonetworks-site-verification=b6c919476067691db128e9375b002b801db8ab2a1de767bc27acb829530c59bd"
"snowflake-verification=5bf2f458-019f-1000-8b08-000000000420"
"gitkraken-domain-verification=82a0c351cecd44e7da8f5254930e2b9f4508718255d575583f48949e4a887399"
"pexip-ms-tenant-domain-verification=31cff1f1-d4b6-492b-8d98-5b42f38c3949"
"airtable-verification=644c0c83b6807a2a10c20d4cf57505d7"
"google-site-verification=XdqEZdbhoNgKou31_aOrVN98TKJqxC0Ve3hNPBmSM7M"
"aws-domain-verification=c326827a-0d9a-4061-a35d-1ea2a8afc6f5"
"docusign=8fb076b3-05e6-41c4-a6ee-6f6227be4b11"
"browserstack-domain-verification=e23475d1-ef64-4cf7-bf92-7620239fe86a"
"pendo-domain-verification=XM4f85DQvo0VLA8QzSh-M0bjGEs"
"airtable-verification=31e52307c66bf62d16697b7f0439d35e"
"adobe-idp-site-verification=8c9c59d410322404f7d75a0b3c770ce7b87cf141707b58224143253e1149f489"
"openai-domain-verification=dv-z3jR2RoYFRLipmXTqN9mx5hU"
"3587620"
"eYZbzQ91r/pvvnV/FdrbHyREx7EaAwWLeNYk/EMQrJiGpNCsX4tJcWlHJDFzifTDbfnlhI6koqrm0dYgkIfncg=="
"autodesk-domain-verification=9qi_qkHrCGa8onVbz33s"
"atlassian-domain-verification=J+tB36tc4CyLsnqZ/MTW5tI3SZ+IOFAGTWEgMbo+FLRl+gvI4cSIQmMmTYOPEbTz"
"paloaltonetworks-site-verification=b51e185f274a13eccff6f0e001549d4a2f08fc11c599ffde8f295cc7cf4c3138"
"amazonses:RYuDm+T3xJC87y0v4Cj4JlDm9d5enVzIZcr/arCF7J0="
"atlassian-domain-verification=n+yfnu4Su0J6uQkiatjL+lTNjzOZrPUGOpVn+HiHPwwDgMivjJD5Pwg7yzepfmIC"
"teamviewer-sso-verification=4a24e296450940f48ac4faba9a172fc0"
"mongodb-site-verification=ucqyDX29txaTTi3K4euWVtieT0zCXRrg"
"smartsheet-site-validation=x1Hv84--jB9jvo7M0QQviDXPy_81zS_t"
"airtable-verification=709aa8e31ed274aa8abc0f3a9286141f"
"atlassian-domain-verification=C34TI2IiJOrziv9uyV2Yva6ZoRRCSZPjqc15wZASQfypHgNMl6esmkpDsYYXhjk7"
"airtable-verification=00fd4b2a11b394abba9d040c40502707"
"intersight=3c7c5c60389a6b81830ef696f8761bc121ecf3f10d7cf8eef08f66af90451a8f"

NS

5 record(s)

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

SOA

1 record(s)

dns101.comcast.net. domregtech.comcastonline.com. 2009105038 7200 3600 1209600 900

CAA

0 record(s)

—

Not configured

DS

1 record(s)

9764 13 2 705C2E769020C2AA0583D5AC58D410BF0714ABA694C5C07D37231584 2273D028

DNSKEY

2 record(s)

256 3 13 bHDsXNJ7KqOfnSbfP0h1jkgIUUE4YTP6dRYlX77lmtiX8fza0Ajioi/U MZ7NAQpgjENSfAFt8JQPGrLPf4T0Hw==
257 3 13 nzcaaCs20dIRsfvG2udjlYkgP1xXnak/Xm6QgB7H1G2I9ee4zLYezUzN w8R1RnCoyhw4qF21yJ16NQCahAH5XQ==

RRSIG

9 record(s)

A 13 2 300 20260810163102 20260803132602 21954 comcast.com. r8sP1u1X4vnPdaED4Ly/QbA5n20Gcp52qY9MT0bgeTmzXlgDvyWJ5g5P lNEtl297Vm9D0gaP086TCaDN4D5ekQ==
NS 13 2 7200 20260810163102 20260803132602 21954 comcast.com. 1eKHUSoW/PymI5IvbXVt43g1S7gJWnSOjRz1ExERV2+5fnahqYxlCUmp ri1O6By257ogG1t/+D7ncEilNgMPMw==
NSEC 13 2 3600 20260810163102 20260803132602 21954 comcast.com. b7SRa02QjZxXe/rsQTo8dzEbGXKid8EejS3iRiLPnwF97O0cEFl6AqSo 9a/LrK7hp5P04stWMDhzhEx8wgYg3g==
DNSKEY 13 2 3600 20260810163102 20260803132602 21954 comcast.com. j9TKPgirPx98c2LnXRw3mDQRh+1RywKfVLi1uoiOfxPkCYF3ertN82po sS/cIwxbTXEzDJLgg/MQP53OikPABA==
DNSKEY 13 2 3600 20261013133102 20260615133102 9764 comcast.com. XhrY7W26x96psJdQIcsYgd5Brtnl+E/q1bG3RQXAdE4hsxiTn3GMxC6e twZE5Y9+lu9NvxlW/Cc8WilgsAqOmA==
SOA 13 2 3600 20260810163102 20260803132602 21954 comcast.com. ciKGeTOjp0vmr1cRy+IGM2FJkK5/ZXU7PLKid68A2wOXzi+KYKZ5p5dT WUVizVOUIhcPTj8nrd5xvaJPhUpHUQ==
TXT 13 2 7200 20260810163102 20260803132602 21954 comcast.com. qTmabfEkRlmBLiKQ6AkZTcrUKe3UAUaqxRdap4kq9ctKPS559ZZkFumH sDwbYAtOSbf/dM8n0u/kcC8zGO6UMA==
MX 13 2 300 20260810163102 20260803132602 21954 comcast.com. u2RpJum4+jEQ7kLZmg0XxpuqrcHfQcXNF7WW/r9bSHwpAfDo8d10nXLb ggwtrStqHzBqxDI6TFCusjgVyA80Rw==
DS 13 2 86400 20260816032036 20260809021036 41446 com. 6xYoCbmQhlEV+9ksOa0F2nCsszS8zBLYRsuQjguqUJU+UiJKmXVAqzeo D5EcyvwsK9TzFe3x2EH51i7ANdbDbA==

NSEC

1 record(s)

12c.comcast.com. A NS SOA MX TXT RRSIG NSEC DNSKEY

NSEC3

0 record(s)

—

Not configured

SRV

0 record(s)

—

Not configured

NAPTR

0 record(s)

—

Not configured

TLSA

0 record(s)

—

Not configured

SSHFP

0 record(s)

—

Not configured

SPF

Configured

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

DMARC

Configured

v=DMARC1;p=reject;fo=1;rua=mailto:dmarc_rua@emaildefense.proofpoint.com,mailto:dmarc-rua@dmarctest.comcast.net;ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com

DKIM

Selector k1

k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDbNrX2cY/GUKIFx2G/1I00ftdAj713WP9AQ1xir85i89sA2guU0ta4UX1Xzm06XIU6iBP41VwmPwBGRNofhBVR+e6WHUoNyIR4Bn84LVcfZE20rmDeXQblIupNWBqLXM1Q+VieI/eZu/7k9/vOkLSaQQdml4Cv8lb3PcnluMVIhQIDAQAB;

Analyzed webpageMetadata and HTTP response

Title and description

No data

Title

Description

Final URL

https://comcast.com/

HTTP status

HTTP

Status

Final URL

https://comcast.com/

Version

Server

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Unavailable

Available

Issuer

Valid from

Valid until

Days remaining

Protocol

Cipher

Security headers

0 active

—

HSTSNot detected

—

Content Security PolicyNot detected

—

X-Content-Type-OptionsNot detected

—

X-Frame-OptionsNot detected

—

Referrer PolicyNot detected

—

Permissions PolicyNot detected

—

Cross-Origin-Opener-PolicyNot detected

—

Cross-Origin-Embedder-PolicyNot detected

—

Cross-Origin-Resource-PolicyNot detected

DNS propagationComparison across public resolvers

Public resolver comparison

Consistent

✓

Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

96.99.227.0

34,55 ms

Cloudflare

1.1.1.1

96.99.227.0

47,42 ms

Quad9

9.9.9.9

96.99.227.0

35,64 ms

OpenDNS

208.67.222.222

96.99.227.0

28,10 ms

AdGuard

94.140.14.14

96.99.227.0

65,23 ms

IP, geolocation and ASNAssociated network information

96.99.227.0

No data

success

country

region

city

asn

organization

isp

Visitor information

Visitor

216.73.217.62

reverse

country

country_code

region

city

latitude

longitude

isp

organization

asn

timezone

browser

Other

language

user_agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

is_bot

Yes

cloudflare

SMTPEmail port connectivity

mxa-00143702.gslb.pphosted.com

Port 25: Closed/unreachable - 50.7 ms - 
Port 465: Closed/unreachable - 49.9 ms - 
Port 587: Closed/unreachable - 22.3 ms -

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