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Find risks

DNS lookup
Every record for a domain, blocklists for an IP
Trust map
Every domain your email depends on
Find lookalikes
Names registered to look like yours

Fix records

Write records
Tick who sends as you, get the records
Route to Refused
Safe, tested steps to refuse forged mail
Try a change
Preview an edit before you publish
Check DNS changes
See who has your new record yet

Read your mail

Trace an email
Paste headers to see a message's route
Read DMARC reports
Provider XML reports, made readable

Many domains

Check a fleet
Up to 25 domains in one table, worst first
Compare
Up to 4 domains side by side
Badges and API
README badge, JSON and a CI check

Reading DNS…

Stamp

Lookups read public DNS. Answers are shared for up to five minutes. Nothing is saved.

No emails were forged in the making of this site.

Designed and built independently.

github.com DNS records | Stamp

Domain or IP addressDomain

github.com

7 of 9 record types published. Grade its email setup

A1 AAAA0 MX1 TXT24 NS8 CNAME0 SOA1 CAA7 DMARC1

A1

Website address, IPv4

140.82.112.4TTL 24

AAAA

Website address, IPv6

None published

MX1

Where its mail goes

0github-com.mail.protection.outlook.com

TXT24

Notes, SPF among them

SPFv=spf1 ip4:192.30.252.0/22 include:spf.protection.outlook.com include:_netblocks.google.com include:_netblocks2.google.com include:mail.zendesk.com include:_spf.salesforce.com include:servers.mcsv.net include:mktomail.com include:sendgrid.net ip4:62.253.227.114 ip4:166.78.69.169 ip4:166.78.69.170 ip4:166.78.71.131 ~all
00Dd0000000hHE0=1TBKg000000TN2r

NS8

Who answers for its DNS

dns1.p08.nsone.net
dns2.p08.nsone.net
dns3.p08.nsone.net
dns4.p08.nsone.net
ns-1283.awsdns-32.org

CNAME

Alias for another name

None published

SOA1

The zone's admin details

dns1.p08.nsone.net hostmaster.nsone.net 1656468023 43200 7200 1209600 3600

CAA7

Who may issue its certificates

0 issue "sectigo.com"
0 issuewild "digicert.com"
0 issuewild "letsencrypt.org"
0 issuewild "sectigo.com"
0 issue "digicert.com"
0 issue "globalsign.com"
0 issue "letsencrypt.org"

DMARC1

What to do with forged mail

v=DMARC1; p=quarantine; sp=reject; pct=100; rua=mailto:dmarc@github.com; ruf=mailto:dmarc@github.com; fo=1

Blocklists

Mail server github-com.mail.protection.outlook.com (52.101.40.104)

Clear on all 6 lists.

Spamhaus ZEN

docusign=087098e3-3d46-47b7-9b4e-8a23028154cd

MS=6BF03E6AF5CB689E315FB6199603BABF2C88D805

MS=ms44452932

MS=ms58704441

Show 18 more

TAILSCALE-xOzoDvFUzZr5YYVCQFuD
Verificationadobe-idp-site-verification=b92c9e999aef825edc36e0a3d847d2dbad5b2fc0e05c79ddd7a16139b48ecf4b
Verificationanthropic-domain-verification-4az7qn=if8YWuRRqwLycGJDooumzHtxm
Verificationapple-domain-verification=RyQhdzTl6Z6x8ZP4
Verificationatlassian-domain-verification=jjgw98AKv2aeoYFxiL/VFaoyPkn3undEssTRuMg6C/3Fp/iqhkV4HVV7WjYlVeF8
Verificationcalendly-site-verification=at0DQARi7IZvJtXQAWhMqpmIzpvoBNF7aam5VKKxP
Verificationcursor-domain-verification-gtfwmt=1rfLOtiTngX5QSxD5HvNKTvm3
Verificationfacebook-domain-verification=39xu4jzl7roi7x0n93ldkxjiaarx50
Verificationgoogle-site-verification=82Le34Flgtd15ojYhHlGF_6g72muSjamlMVThBOJpks
Verificationgoogle-site-verification=UTM-3akMgubp6tQtgEuAkYNYLyYAvpTnnSrDMWoDR3o
Verificationjamf-site-verification=XtaPNIYghF_e_xRDI8CjgQ
Verificationkrisp-domain-verification=ZlyiK7XLhnaoUQb2hpak1PLY7dFkl1WE
Verificationloom-site-verification=f3787154f1154b7880e720a511ea664d
Verificationmiro-verification=d2e174fdb00c71e0bcf58f8e58c3da2dd80dcfa9
Verificationopenai-domain-verification=dv-3nh33eQwdkotMIAzLrIDVZo1
Verificationserval-domain-verification-ydryhj=qbkiEakpwEpTvHh5fIiCqtaue
Verificationshopify-verification-code=t1YPwcmvnxZyBycaCpk1MPyWoFs72o
Verificationstripe-verification=f88ef17321660a01bab1660454192e014defa29ba7b8de9633c69d6b4912217f

ns-1707.awsdns-21.co.uk

ns-421.awsdns-52.com

ns-520.awsdns-01.net

SpamCop

Domain

Not listed on Spamhaus DBL.

Spamhaus DBL