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90
Total
100
DNS
95
Email
77
Security
70
Network
100
Availability
Domainnostarch.com
IPv42
IPv62
MX records5
StatusActive
Domain technical report

No Starch Press | "The finest in geek entertainment"

nostarch.com

No Starch Press publishes the finest in geek entertainment — books on programming, hacking, Linux, security, and more for the technically curious.

Generated: 2026-08-11T01:50:08-05:00 · Cached result

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IPv42
IPv62
MX5
NS2

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 policy5 / 5 pts · Dns

Certificate authority restriction.

✓
DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓
MX records20 / 20 pts · Mail

5 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-STS5 / 5 pts · Mail

Mail transport policy.

!
TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓
Valid TLS certificate55 / 55 pts · Security

84 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers12 / 35 pts · Security

3 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 response40 / 40 pts · Availability

HTTP/2 200

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

2 record(s)
104.20.2.230
104.20.3.230

AAAA

2 record(s)
2606:4700:10::6814:3e6
2606:4700:10::6814:2e6

CNAME

0 record(s)
—

Not configured

MX

5 record(s)
10 alt4.aspmx.l.google.com.
1 aspmx.l.google.com.
10 alt3.aspmx.l.google.com.
5 alt1.aspmx.l.google.com.
5 alt2.aspmx.l.google.com.

TXT

3 record(s)
"bw=PXVbiXL4JNT269Uzl6SnyWQxLllxVRBEcuqXcGriff0B"
"v=spf1 a ip4:94.130.36.169 include:_spf.google.com include:mailgun.org include:servers.mcsv.net ~all"
"google-site-verification=JwUIUbgdQHEGaZ4T4Sgm93jfZnPV9j2Qfg_wwxo78TY"

NS

2 record(s)
rodney.ns.cloudflare.com.
chan.ns.cloudflare.com.

SOA

1 record(s)
chan.ns.cloudflare.com. dns.cloudflare.com. 2411441441 10000 2400 604800 1800

CAA

10 record(s)
0 issue "comodoca.com"
0 issue "pki.goog; cansignhttpexchanges=yes"
0 issuewild "pki.goog; cansignhttpexchanges=yes"
0 issuewild "letsencrypt.org"
0 issuewild "comodoca.com"
0 issue "ssl.com"
0 issue "digicert.com; cansignhttpexchanges=yes"
0 issuewild "digicert.com; cansignhttpexchanges=yes"
0 issuewild "ssl.com"
0 issue "letsencrypt.org"

DS

1 record(s)
2371 13 2 E04972DA0942D54AC8A9C80D881C2D6C3F4E657BE632905777CFA2A4 03D22255

DNSKEY

2 record(s)
256 3 13 oJMRESz5E4gYzS/q6XDrvU1qMPYIjCWzJaOau8XNEZeqCYKD5ar0IRd8 KqXXFJkqmVfRvMGPmM1x8fGAa2XhSA==
257 3 13 mdsswUyr3DPW132mOi8V9xESWE8jTo0dxCjjnopKl+GqJxpVXckHAeF+ KkxLbxILfDLUT0rAK9iUzy1L53eKGQ==

RRSIG

6 record(s)
DNSKEY 13 2 3600 20261001185140 20260801185140 2371 nostarch.com. g5XARtYn0BAthuqRYYB0JIIaSsGWf33McaQPSGre76Hy2+VQIBDM6sN9 33RkOhvI4c7NEopxPBDtqXWJbZx7tg==
TXT 13 2 300 20260812074958 20260810054958 34505 nostarch.com. E9JsNKh75SxGWa0J32aJilO4lcBqO7gEKlVZx44rRggqS/F+ocIcrE0j 9+BhA1dMxIr9BQ7zrmIJAxr2kZPrDQ==
AAAA 13 2 300 20260812074958 20260810054958 34505 nostarch.com. 6ZdOg7M9diWjN55H1EB9KH7+hN3eZCb1SUzbeCGdEpvMuCDTMJrq2NFo Rl1GodRtXtanAmCE1JKM4L9mOPZaYA==
DS 13 2 86400 20260817025324 20260810014324 41446 com. 7T1kbehq3ip4osrgIaq3nP686dy7GFm7DwErwreq9IAy9LXOw4CJmEOU tb7ej61XcXGbZ/eLU+lgSfdDTY9hFA==
NS 13 2 86400 20260812063813 20260810043813 34505 nostarch.com. PUXqy4sG12FPnwX4eX0tZ9W+P0qchf/xSnM4K0ulDOgoEHdfo/tOyXEP kOzAHMPEHbq7kZUN5dXZe7pdS4D7cA==
CAA 13 2 3600 20260812074958 20260810054958 34505 nostarch.com. OjlKJkjEk6lBBJ2byaceWtrukyrwuuLgLU3Hj7tR9dVtxTl+cLBDUSI0 dzRyTHUkFbXCo/5U1u3jMv5AfIEpGw==

NSEC

1 record(s)
\000.nostarch.com. 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

Configured
v=spf1 a ip4:94.130.36.169 include:_spf.google.com include:mailgun.org include:servers.mcsv.net ~all

DMARC

Configured
v=DMARC1; p=reject; pct=100; rua=mailto:5224bb6ff01f4d278a437c1be259f686@dmarc-reports.cloudflare.net,mailto:re+0697c0f3fc05@inbound.dmarcdigests.com

DKIM

Selector google
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAup43hiRxdFrf5mmztGH4bsIQNXXJi3t5Al0XQuKpYn6+yQBnsTMWckOiaw7LF2RuHrp0W55V17cJOTkI5mrioLBLH7SrnrLxtPhZ1m7sCrILN9UnAAWHAvlY4hhm69jI4PPpTWyD9GuXXus1Ky2VTIKGXUmVNc8X7Jr36pKrGcPHlKRkgUva6+SJFMrnMaSJ+CZXhJD9sHXDFr2uJ5hfRFuwAue7/Ano0zXeFimHLx6Qlys0gJGW34yGwvOwG/DZI9AMER0dXIskOwAvKmDfYdolSaenTX18X4Hu8x4riILuZh/sOP/bK7Hmb5IuPNHfB2fwkEaklBqZ4D90xuLOpwIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
No Starch Press | "The finest in geek entertainment"
Description
No Starch Press publishes the finest in geek entertainment — books on programming, hacking, Linux, security, and more for the technically curious.
Final URL
https://nostarch.com/
HTTP status
200

HTTP

Status
HTTP/2 200
Final URL
https://nostarch.com/
Version
3
Server
cloudflare
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Let's Encrypt
CN
nostarch.com
Valid from
2026-08-05T12:49:35-05:00
Valid until
2026-11-03T11:49:34-06:00
Days remaining
84
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

Security headers

3 active
✓
HSTSImplemented
—
Content Security PolicyNot detected
✓
X-Content-Type-OptionsImplemented
✓
X-Frame-OptionsImplemented
—
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
104.20.2.230, 104.20.3.230
68,97 ms
Cloudflare
1.1.1.1
104.20.2.230, 104.20.3.230
54,79 ms
Quad9
9.9.9.9
104.20.2.230, 104.20.3.230
48,60 ms
OpenDNS
208.67.222.222
104.20.2.230, 104.20.3.230
99,52 ms
AdGuard
94.140.14.14
104.20.2.230, 104.20.3.230
73,55 ms

IP, geolocation and ASNAssociated network information

104.20.2.230

No data
success
No
country
region
city
asn
organization
isp

104.20.3.230

No data
success
No
country
region
city
asn
organization
isp

Visitor information

Visitor
ip
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

alt4.aspmx.l.google.com

Port 25: Closed/unreachable - 23.8 ms - 
Port 465: Closed/unreachable - 4016.7 ms - 
Port 587: Closed/unreachable - 4040 ms -

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