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Total

DNS

Email

Security

Network

100

Availability

Domainstackoverflow.co

IPv42

IPv60

MX records4

StatusActive

Domain technical report

Stack Overflow Business: Solve work’s biggest challenges - Stack Overflow

stackoverflow.co

Unlock growth and shape progress. Get the community-powered knowledge and trusted tools technologists and enterprises need to succeed today.

Generated: 2026-08-09T12:55:45-05:00 · Cached result

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IPv42

IPv60

MX4

NS4

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

2 IPv4 address(es) detected.

IPv6 (AAAA)0 / 10 pts · Dns

0 IPv6 address(es) detected.

✓

Name server redundancy20 / 20 pts · Dns

4 NS record(s); 2 or more required.

✓

SOA record10 / 10 pts · Dns

Authoritative zone record.

DNSSEC chain0 / 15 pts · Dns

Both DS and DNSKEY are required.

✓

CAA policy5 / 5 pts · Dns

Certificate authority restriction.

✓

DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓

MX records20 / 20 pts · Mail

4 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-STS0 / 5 pts · Mail

Mail transport policy.

TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓

Valid TLS certificate55 / 55 pts · Security

62 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers8 / 35 pts · Security

2 of 9 evaluated headers detected.

✓

PTR reverse DNS30 / 30 pts · Network

PTR: afa7f374f51cc8991.awsglobalaccelerator.com

✓

IPv4 diversity35 / 35 pts · Network

Two or more IPv4 addresses receive full points.

IPv6 connectivity0 / 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)

3.33.186.135
15.197.167.90

AAAA

0 record(s)

—

Not configured

CNAME

0 record(s)

—

Not configured

MX

4 record(s)

5 alt2.aspmx.l.google.com.
10 alt3.aspmx.l.google.com.
5 alt1.aspmx.l.google.com.
1 aspmx.l.google.com.

TXT

5 record(s)

"adobe-idp-site-verification=25ba5203f3687c9cd6ee3223ee5de1528917828d1da3ebd3bd9a44094cbfc4ac"
"v=spf1 include:_spf.google.com ~all"
"facebook-domain-verification=y59jadh8mrlmq9v3u8ff5z42rd7723"
"google-site-verification=NihQgsb9hY_bT_4JYEJSkeLKgkAJyPFFDEqD82p76ug"
"google-site-verification=X9QXJIDLaXpZ5fQgAqrgCNUD5o4P_rRk5JI2YELPqf4]"

NS

4 record(s)

dns3.p02.nsone.net.
dns4.p02.nsone.net.
dns2.p02.nsone.net.
dns1.p02.nsone.net.

SOA

1 record(s)

dns1.p02.nsone.net. domains+netlify.netlify.com. 1662569678 43200 7200 1209600 3600

CAA

7 record(s)

1 issue "letsencrypt.org"
1 issuewild "letsencrypt.org"
1 issue "digicert.com"
1 issuewild "comodoca.com"
1 iodef "mailto:sysadmin-team@stackoverflow.com"
1 issue "comodoca.com"
1 issuewild "digicert.com"

DS

0 record(s)

—

Not configured

DNSKEY

0 record(s)

—

Not configured

RRSIG

0 record(s)

—

Not configured

NSEC

0 record(s)

—

Not configured

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 include:_spf.google.com ~all

DMARC

Configured

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

DKIM

Selector google

v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAplHtdE1zsq2wkZ775faAIcsQk8mylD2UAhFrUe78o0tnFIgn6TKLfNqIyZZ1ZZ/+2QJ4X2CR5n0ly6LrFwuURReInJgOg1ed0Arac5utqCVSfwq5rm93jAfcPnOaiofO61YHuNRNuMy6G1ep6xoUo49kgyje2yww86mn8QcT3aPsgMXisgDf+W27pQFiIqy1c15DjlVstZpPGaeQipy6v2pNmIcHe3VSXwb3Zuhb5YarzJATaKIS9fyynJ4nsLT4DEum68uQJJSUuUT6JJpAZ7Ggt8igRg/nt7mFIGnWTE7swJhMpmYuUquBQV5bpR1NJVSX27ot8FDowYE3U1BVNwIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Stack Overflow Business: Solve work’s biggest challenges - Stack Overflow

Description

Unlock growth and shape progress. Get the community-powered knowledge and trusted tools technologists and enterprises need to succeed today.

Final URL

https://stackoverflow.co/

HTTP status

206

HTTP

Status

HTTP/2 200

Final URL

https://stackoverflow.co/

Version

Server

Netlify

X-Powered-By

Nuxt

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Let's Encrypt

*.secret-pr.resources.stackoverflow.co

Valid from

2026-07-12T23:30:07-05:00

Valid until

2026-10-10T23:30:06-05:00

Days remaining

Protocol

TLSv1.3

Cipher

TLS_AES_128_GCM_SHA256

Security headers

2 active

✓

HSTSImplemented

—

Content Security PolicyNot detected

✓

X-Content-Type-OptionsImplemented

—

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

Consistent

✓

Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

15.197.167.90, 3.33.186.135

71,57 ms

Cloudflare

1.1.1.1

15.197.167.90, 3.33.186.135

77,91 ms

Quad9

9.9.9.9

15.197.167.90, 3.33.186.135

154,97 ms

OpenDNS

208.67.222.222

15.197.167.90, 3.33.186.135

66,23 ms

AdGuard

94.140.14.14

15.197.167.90, 3.33.186.135

59,65 ms

IP, geolocation and ASNAssociated network information

3.33.186.135

No data

success

country

region

city

asn

organization

isp

15.197.167.90

No data

success

country

region

city

asn

organization

isp

Visitor information

Visitor

216.73.217.62

reverse

country

country_code

region

city

latitude

longitude

isp

organization

asn

timezone

browser

Other

language

user_agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

is_bot

Yes

cloudflare

SMTPEmail port connectivity

alt2.aspmx.l.google.com

Port 25: Closed/unreachable - 1.2 ms - 
Port 465: Closed/unreachable - 4003.6 ms - 
Port 587: Closed/unreachable - 4019.4 ms -

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