GI

Github.com Domain Trust Report

ACTIVE GitHub — world's largest software development platform
PRISM VERDICT

github.com scores well overall but has attention areas in SSL Certificate and Email Auth. All other dimensions are healthy.

Last scanned 4m ago · Sep 21, 2026
Run live scan Visit site
OVERALL TRUST SCORE
85 GRADE B
SSL warn
DNS Healthy
EMAIL Strong
SSL GRADE
B
Expires in 69d
DNS HEALTH
100%
8 nameservers
EMAIL AUTH
2/3
SPF · DKIM · DMARC
HEADERS
A+
Score: 90/100
DOMAIN EXPIRY
749d
Oct 9, 2028
Warning conditions detected — some monitoring checks are in warning state.

Registration & ownership

WHOIS
Registrar MarkMonitor Inc.
Registered Oct 9, 2007
Updated Sep 7, 2026
Expires Oct 9, 2028 749d
Status client delete prohibit.
github.com is registered with MarkMonitor Inc., since Oct 9, 2007. Domain registration expires Oct 9, 2028 (749 days). Status: client delete prohibited.
Full WHOIS report

DNS records

DNS
A 20.205.243.166
MX github-com.mail.protection.outlook.com (pri 0)
NS dns1.p08.nsone.netdns2.p08.nsone.netdns3.p08.nsone.netdns4.p08.nsone.netns-1283.awsdns-32.orgns-1707.awsdns-21.co.ukns-421.awsdns-52.comns-520.awsdns-01.net
TXT 00Dd0000000hHE0=1TBKg000000TN2rMS=6BF03E6AF5CB689E315FB6199603BABF2C88D805MS=ms44452932MS=ms58704441TAILSCALE-xOzoDvFUzZr5YYVCQFuD +19 more
CAA digicert.comglobalsign.comletsencrypt.orgsectigo.com
github.com resolves to 20.205.243.166. Nameservers: dns1.p08.nsone.net, dns2.p08.nsone.net (+6). Mail handled by 1 MX record.
Full DNS lookup

Hosting & network

NETWORK
IP address 20.205.243.166
Nameservers dns1.p08.nsone.netdns2.p08.nsone.netdns3.p08.nsone.netdns4.p08.nsone.netns-1283.awsdns-32.orgns-1707.awsdns-21.co.ukns-421.awsdns-52.comns-520.awsdns-01.net
Protocol HTTPS HTTP/2
github.com is hosted at 20.205.243.166. No IPv6 addresses detected. DNS is managed through 8 nameservers (dns1.p08.nsone.net).
Full IP analysis

SSL / TLS

SECURITY
Valid · B Sectigo Limited · expires Nov 30, 2026
69 days remaining
TLS 1.3 TLS 1.2 TLS 1.1 TLS 1.0
Full SSL report

Technology detected

STACK
GitHub PagesFastly CDNHSTSTLS 1.3PJAX
Full tech scan

30-day availability

MONITORING
99.90% no incidents
30d ago today

Email authentication

EMAIL
Full email auth report

Monitoring events

374 total EVENTS
DNS A record modified 6h ago
medium dns DNS_RECORD_MODIFIED
dns.a
DNS A record modified 6h ago
medium dns DNS_RECORD_MODIFIED
dns.a
DNS A record modified 7h ago
medium dns DNS_RECORD_MODIFIED
dns.a
+359 more — view live
Run a specific check on github.com:
DNS lookup WHOIS SSL check Security headers Email auth Screenshot
DOMAIN LIFECYCLE
Registered Oct 9, 2007 18 years old
Last updated Sep 7, 2026
Expires Oct 9, 2028 749 days remaining
Registrar MarkMonitor Inc.
SSL issued by Sectigo Limited
DOMAIN INTELLIGENCE

What we know about Github.com

Github.com has been registered for 18 years (since Oct 9, 2007), managed through MarkMonitor Inc., ranked #31 globally by Tranco, categorised as developer tools. Its current health score is 85/100 (grade B), reflecting strong SSL, DNS, and email authentication posture. As a developer platform, its security header configuration and email authentication directly affect downstream CI/CD pipelines and OAuth integrations that depend on it.

Security Posture Grade B

github.com's security posture: SSL certificate needs attention — only 69 days until expiry; security headers are well-configured; no blacklist entries found.

SSL warn
Headers A+
SSL expiry 69d
Health score 85/100
Email Authentication Strong

SPF is configured, restricting which servers can send email as this domain. DMARC policy is set to "quarantine" — suspicious emails are quarantined.

SPF Configured
DMARC policy quarantine
Spoofable No
Network Infrastructure

github.com resolves to 20.205.243.166, DNS is managed through dns1.p08.nsone.net and dns2.p08.nsone.net (+6 more), email routed through 1 MX record.

Primary IP 20.205.243.166
Nameservers 8
MX records 1
A records 1
DomainScan monitors github.com continuously — DNS every hour, SSL & email auth every 6 h, security headers every 12 h, WHOIS every 24 h. Every detected change triggers a severity-classified monitoring event. Refreshed 4m ago
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