Domain technical report
Page Not Found · GitBook (Legacy)
gitbooks.io
IPv42
IPv62
MX0
NS2
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59
Total
95
DNS
0
Email
65
Security
70
Network
60
Availability
Domaingitbooks.io
IPv42
IPv62
MX records0
StatusActive
DiagnosticsMain findings and recommendations
IPv4 (A)30 / 30 pts · Dns
2 IPv4 address(es) detected.
IPv6 (AAAA)10 / 10 pts · Dns
2 IPv6 address(es) detected.
Name server redundancy20 / 20 pts · Dns
2 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 records0 / 20 pts · Mail
0 MX record(s).
SPF0 / 25 pts · Mail
SPF policy not found.
DMARC0 / 25 pts · Mail
DMARC policy not found.
DKIM0 / 20 pts · Mail
No tested DKIM selector responded.
MTA-STS0 / 5 pts · Mail
Mail transport policy.
TLS-RPT0 / 5 pts · Mail
TLS reporting policy.
Valid TLS certificate55 / 55 pts · Security
41 day(s) remaining.
Certificate lifetime10 / 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 DNS0 / 30 pts · Network
PTR not detected.
IPv4 diversity35 / 35 pts · Network
Two or more IPv4 addresses receive full points.
IPv6 connectivity35 / 35 pts · Network
AAAA availability.
DNS resolution40 / 40 pts · Availability
At least one address family must resolve.
HTTP response0 / 40 pts · Availability
HTTP/2 400
HTTPS final URL20 / 20 pts · Availability
Final URL uses HTTPS.
DNS and emailPublished records and email configuration
A
2 record(s)104.18.41.89 172.64.146.167
AAAA
2 record(s)2606:4700:4403::6812:2959 2a06:98c1:3105::ac40:92a7
CNAME
0 record(s)—
Not configured
MX
0 record(s)—
Not configured
TXT
1 record(s)"f7r5tn8oacfm58aeronglhg4fh"
NS
2 record(s)hugh.ns.cloudflare.com. dahlia.ns.cloudflare.com.
SOA
1 record(s)dahlia.ns.cloudflare.com. dns.cloudflare.com. 2411248170 10000 2400 604800 1800
CAA
0 record(s)—
Not configured
DS
1 record(s)2371 13 2 18138E610A9B9A423459A5AFCAC223F1090937E2817CDADBFA8F24B7 797FC4B2
DNSKEY
2 record(s)256 3 13 oJMRESz5E4gYzS/q6XDrvU1qMPYIjCWzJaOau8XNEZeqCYKD5ar0IRd8 KqXXFJkqmVfRvMGPmM1x8fGAa2XhSA== 257 3 13 mdsswUyr3DPW132mOi8V9xESWE8jTo0dxCjjnopKl+GqJxpVXckHAeF+ KkxLbxILfDLUT0rAK9iUzy1L53eKGQ==
RRSIG
4 record(s)DNSKEY 13 2 3600 20261002130745 20260802130745 2371 gitbooks.io. J8NoWQiHryp0cABYttLkB8FoGHwyiZhqjb/tGXYl1wQDuoVdSpIRHHhH 2WA3Y7aALfSmlQeL9npYy6K6ZnH8YQ== NS 13 2 86400 20260811003045 20260808223045 34505 gitbooks.io. DnQxVxaqPujdRmRa6BVUN6DVuXRC3moZ6fB09mPzH8TQBXnrzsUfS/dc 3FeYtzAN8sdqGHz2P1wKV+MM9mtcuA== AAAA 13 2 300 20260811003045 20260808223045 34505 gitbooks.io. Cfj1usFUDXE2wjF4QIhkbyigP1kcum2+UTTbwqIzKBHd0ORoGZA181Rg LfjVhimt3BQRcGyMAgkqKH5cuwIftw== DS 8 2 3600 20260830160952 20260809150952 46863 io. LaL3lc+w9gwc9KJIhgSDmkF/Do6muNcavA7WpnxX0ihobBosKWmQgh0O PTQvaJAeoYNuEBJ9bEaeVP4H+QwEa7Oi4Njrl1o+xBq3j/T+0wShAC+w cm2kqidStI04uBB1ACzHqkkaojfNleX8KBnjiAZDkhtwiFBjCjvitJCn Dtk=
NSEC
1 record(s)\000.gitbooks.io. A NS SOA PTR HINFO MX TXT AAAA LOC SRV NAPTR CERT SSHFP RRSIG NSEC DNSKEY TLSA SMIMEA HIP CDS CDNSKEY OPENPGPKEY SVCB HTTPS URI CAA
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
Not configured—
Not configured
DMARC
Not configured—
Not configured
DKIM
Not found—
Not configured
Analyzed webpageMetadata and HTTP response
Title and description
ExtractedTitle
Page Not Found · GitBook (Legacy)
Description
Final URL
https://gitbooks.io/
HTTP status
400
HTTP
Status
HTTP/2 400
Final URL
https://gitbooks.io/
Version
3
Server
cloudflare
X-Powered-By
SSL and HTTP securityCertificate, protocol and security headers
SSL certificate
AvailableAvailable
Yes
Issuer
Google Trust Services
CN
gitbooks.io
Valid from
2026-06-22T00:47:52-05:00
Valid until
2026-09-20T01:47:41-05:00
Days remaining
41
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384
Security headers
0 activeHSTSNot 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
ConsistentConsistent propagation
5 public resolvers queried.
ResolverServerResultLatency
Google
8.8.8.8104.18.41.89, 172.64.146.167
55,65 ms
Cloudflare
1.1.1.1104.18.41.89, 172.64.146.167
42,15 ms
Quad9
9.9.9.9104.18.41.89, 172.64.146.167
90,98 ms
OpenDNS
208.67.222.222104.18.41.89, 172.64.146.167
63,31 ms
AdGuard
94.140.14.14104.18.41.89, 172.64.146.167
47,63 ms
IP, geolocation and ASNAssociated network information
104.18.41.89
Identifiedsuccess
Yes
country
United States
country_code
US
region
California
city
San Francisco
latitude
37.7749113
longitude
-122.4185412
asn
13335
organization
Cloudflare, Inc.
isp
Cloudflare, Inc.
timezone
America/Los_Angeles
172.64.146.167
Identifiedsuccess
Yes
country
United States
country_code
US
region
California
city
San Francisco
latitude
37.7749113
longitude
-122.4185412
asn
13335
organization
Cloudflare, Inc.
isp
Cloudflare, Inc.
timezone
America/Los_Angeles
Visitor information
Visitorip
216.73.217.62
reverse
country
country_code
region
city
latitude
longitude
isp
organization
asn
timezone
browser
Other
os
Other
language
user_agent
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
is_bot
Yes
cloudflare
No
SMTPEmail port connectivity
gitbooks.io
Port 25: Closed/unreachable - 0.9 ms - Port 465: Closed/unreachable - 4020.8 ms - Port 587: Closed/unreachable - 4019.8 ms -