IPv4 Addresses
gitbook.io. 300 IN A 104.18.40.47 gitbook.io. 300 IN A 172.64.147.209
IPv6 Addresses
gitbook.io. 300 IN AAAA 2606:4700:4401:0:0:0:AC40:93D1 gitbook.io. 300 IN AAAA 2A06:98C1:310D:0:0:0:6812:282F
Name Servers
gitbook.io. 1200 IN NS dahlia.ns.cloudflare.com. gitbook.io. 1200 IN NS hugh.ns.cloudflare.com.
Mail Servers
gitbook.io. 300 IN MX 10 aspmx.l.google.com. gitbook.io. 300 IN MX 20 alt1.aspmx.l.google.com. gitbook.io. 300 IN MX 20 alt2.aspmx.l.google.com. gitbook.io. 300 IN MX 30 aspmx3.googlemail.com. gitbook.io. 300 IN MX 30 aspmx2.googlemail.com.
SOA Details
gitbook.io. 1200 IN SOA dahlia.ns.cloudflare.com. dns.cloudflare.com. 2417635255 10000 2400 604800 1800
Certificate Authority Authorization
No CAA records were returned at this registrable domain name. With no CAA policy, any public certificate authority (CA) may issue TLS certificates for names under this zone unless a parent publishes CAA; add issue / issuewild / iodef records to restrict issuance.
DMARC
Organizational policy (p): how receivers treat mail that fails aligned DMARC checks — none (monitor only), quarantine (often junk), or reject (block).
pct: share of mail that gets quarantine/reject; 100 = all failing messages (default).
100Aggregate DMARC reports (ZIP/XML). Optional but recommended for visibility.
Forensic (per-failure) reports. Often omitted for privacy or volume.
gitbook.io. 300 IN DMARC v=DMARC1; p=quarantine; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1; pct=100
DKIM
gitbook.io. 300 IN DKIM v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDNOaPg/6XTvWJZ+PIbuRUBF8KZXipVYR+Q2x5UvRpPUFWnqZUoLa5RXRv0Bo73UJ1/XJ2H0rAINYXO1ectF+IyE9gzVrO1+mJ7DLXxK1+XydS3llCNTRo6EN+EuZOEqjoJUQY/EashKB7fjeS7weQptjprHEhg5I8PxY8I9wdRQwIDAQAB
SPF (Sender Policy Framework)
| Qualifier | Mechanism | Target / value | Valid | Details |
|---|---|---|---|---|
| + Pass | a |
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| + Pass | mx |
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| + Pass | include |
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| + Pass | include |
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| + Pass | include |
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| - Fail | all |
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gitbook.io. 300 IN TXT "v=spf1 a mx include:_spf.google.com include:sendgrid.net include:stspg-customer.com -all"
MTA-STS
This hostname does not publish an MTA-STS policy (no v=STSv1 TXT at _mta-sts.<name> and/or no policy at https://mta-sts.<name>/.well-known/mta-sts.txt).
Text Content
gitbook.io. 300 IN TXT "google-site-verification=9HmRew5KGY83Wzed-UhP71FdHHbV3qoUKP5h_Jenjeo" gitbook.io. 300 IN TXT "google-site-verification=jOO29_Act4pfhfArsLE_txCdET-NuQQyqp1aAG5-H8s" gitbook.io. 300 IN TXT "google-site-verification=mAI4k7A4RaCrAbrsgv7m8w6VPx0irEHUO3bHYEPPwdI" gitbook.io. 300 IN TXT "openai-domain-verification=dv-5coTbUFl8eIUWr3rQkpd9lw2" gitbook.io. 300 IN TXT "8277640" gitbook.io. 300 IN TXT "8lncom12tnn1so22eu2gvaoe9q"