Analyze any domain

Get a complete DNS, email, SSL, HTTP and network analysis in seconds.

Total

DNS

Email

Security

Network

100

Availability

Domainteachingamericanhistory.org

IPv42

IPv62

MX records5

StatusActive

Domain technical report

Teaching American History

teachingamericanhistory.org

Teaching American History is a free resource that brings together primary sources, continuing education, and community for American history teachers.

Generated: 2026-08-11T23:39:30-05:00 · Cached result

JSON CSV PDF Visit site

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 chain0 / 15 pts · Dns

Both DS and DNSKEY are required.

CAA policy0 / 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.

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

78 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 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)

172.67.223.12
104.21.59.106

AAAA

2 record(s)

2606:4700:3032::6815:3b6a
2606:4700:3032::ac43:df0c

CNAME

0 record(s)

—

Not configured

MX

5 record(s)

30 alt2.aspmx.l.google.com.
50 aspmx3.googlemail.com.
20 alt1.aspmx.l.google.com.
40 aspmx2.googlemail.com.
10 aspmx.l.google.com.

TXT

6 record(s)

"google-site-verification=5KaJXwRSam8fzHoOPVACHS5aK4TS0tSWlnkPe5jXNiQ"
"google-site-verification=crMgsrHCrw9HKqJ8Ij0DONZwakNIgVhYtojVQAhzh0E"
"facebook-domain-verification=fwbtvfez7yaut7founxp9hsmu2tk61"
"v=spf1 include:aspmx.pardot.com include:_spf.google.com include:sendgrid.net ip4:198.251.78.26 ip4:5.161.255.242 ip6:2607:f1c0:f024:ce00::1 ip6:2a01:4ff:f0:883a::1 include:47228921.spf10.hubspotemail.net ~all"
"google-site-verification=4jbdJZyT3e67cMro9djfp-vD9rTPrIDPOICwvjhDnHI"
"pardot556702=a7b7f3c4fd0434b147348e91b79134d81b32dee7790cb9a5fd593a95a6fe721e"

NS

2 record(s)

sri.ns.cloudflare.com.
meadow.ns.cloudflare.com.

SOA

1 record(s)

meadow.ns.cloudflare.com. dns.cloudflare.com. 2411025424 10000 2400 604800 1800

SPF

Configured

v=spf1 include:aspmx.pardot.com include:_spf.google.com include:sendgrid.net ip4:198.251.78.26 ip4:5.161.255.242 ip6:2607:f1c0:f024:ce00::1 ip6:2a01:4ff:f0:883a::1 include:47228921.spf10.hubspotemail.net ~all

DMARC

Configured

v=DMARC1;  p=none; rua=mailto:2aa5a06504f847939d5e6db7636ae4b8@dmarc-reports.cloudflare.net

DKIM

Not found

—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Teaching American History

Description

Teaching American History is a free resource that brings together primary sources, continuing education, and community for American history teachers.

Final URL

https://teachingamericanhistory.org/

HTTP status

200

HTTP

Status

HTTP/2 200

Final URL

https://teachingamericanhistory.org/

Version

Server

cloudflare

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Google Trust Services

teachingamericanhistory.org

Valid from

2026-07-31T17:14:53-05:00

Valid until

2026-10-29T18:13:23-05:00

Days remaining

Protocol

TLSv1.3

Cipher

TLS_AES_256_GCM_SHA384

Security headers

2 active

✓

HSTSImplemented

✓

Content Security PolicyImplemented

—

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

Consistent

✓

Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

104.21.59.106, 172.67.223.12

57,09 ms

Cloudflare

1.1.1.1

104.21.59.106, 172.67.223.12

52,59 ms

Quad9

9.9.9.9

104.21.59.106, 172.67.223.12

63,46 ms

OpenDNS

208.67.222.222

104.21.59.106, 172.67.223.12

79,66 ms

AdGuard

94.140.14.14

104.21.59.106, 172.67.223.12

195,10 ms

IP, geolocation and ASNAssociated network information

172.67.223.12

No data

success

country

region

city

asn

organization

isp

104.21.59.106

No data

success

country

region

city

asn

organization

isp

Visitor information

Visitor

216.73.216.212

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 - 4019.4 ms - 
Port 587: Closed/unreachable - 4021.2 ms -

Recently analyzed domains

View all →

kpn.com97 rijksoverheid.nl96 bioscientifica.com80 googletagmanager.com66 uscc.gov96 nwo.nl97 nec.co.jp21 mybook.to54 bc.ca4 cloudflare.com94