Analyze any domain

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

Total

DNS

Email

Security

Network

100

Availability

Domaincrossref.org

IPv44

IPv60

MX records5

StatusActive

Domain technical report

Crossref

crossref.org

Crossref is open infrastructure linking the world's research. 25,000+ members, 167 countries, 2.1 billion monthly API queries.

Generated: 2026-08-09T03:54:36-05:00 · Cached result

JSON CSV PDF Visit site

IPv44

IPv60

MX5

NS4

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

4 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

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-STS0 / 5 pts · Mail

Mail transport policy.

TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓

Valid TLS certificate55 / 55 pts · Security

137 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 DNS30 / 30 pts · Network

PTR: ec2-3-215-11-22.compute-1.amazonaws.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

4 record(s)

3.215.11.22
100.62.15.43
54.175.2.164
32.193.126.239

AAAA

0 record(s)

—

Not configured

CNAME

0 record(s)

—

Not configured

MX

5 record(s)

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

TXT

5 record(s)

"v=spf1 ip4:208.254.38.64/27 ip4:108.26.163.24 ip4:18.233.120.246 include:mail.zendesk.com include:stspg-customer.com include:_spf.google.com include:_spf.intacct.com include:amazonses.com include:_spf.act-on.net ~all"
"intacct-esk=4FED1A49C4B8865AE053DF06A8C02878"
"MS=ms40313232"
"status-page-domain-verification=pmfyw22rmcg9"
"1wnqjfbqpgk7rry20dzzcqmm0fhqpdwm"

NS

4 record(s)

ns-473.awsdns-59.com.
ns-1052.awsdns-03.org.
ns-659.awsdns-18.net.
ns-1629.awsdns-11.co.uk.

SOA

1 record(s)

ns-1052.awsdns-03.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

CAA

4 record(s)

0 issue "letsencrypt.org"
0 issue "amazontrust.com"
0 issuewild "letsencrypt.org"
0 issuewild "amazontrust.com"

SSHFP

0 record(s)

—

Not configured

SPF

Configured

v=spf1 ip4:208.254.38.64/27 ip4:108.26.163.24 ip4:18.233.120.246 include:mail.zendesk.com include:stspg-customer.com include:_spf.google.com include:_spf.intacct.com include:amazonses.com include:_spf.act-on.net ~all

DMARC

Configured

v=DMARC1;p=none;sp=none;adkim=r;aspf=r;rua=mailto:dmarc@crossref.org;ruf=mailto:dmarc@crossref.org;fo=1

DKIM

Selector google

v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCqW8tZ31pYBYBd1h5GE1vl10jKU4blmaK5Xi9r7chZWrwseCFy0CtIlCJ9vinDjvZ5wT3Ss5mol4vbg20TNru1S5MidMzgTlrTwOgi+0ADSf2oEk0XxFYnbIFRCU4GQGV2jnWUiLdAJuD5c/ffvwv7h9NZyVSF1foUhEuoADbv3QIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Crossref

Description

Crossref is open infrastructure linking the world's research. 25,000+ members, 167 countries, 2.1 billion monthly API queries.

Final URL

https://crossref.org/

HTTP status

200

HTTP

Status

HTTP/2 200

Final URL

https://crossref.org/

Version

Server

AmazonS3

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Amazon

crossref.org

Valid from

2026-06-09T19:00:00-05:00

Valid until

2026-12-24T17:59:59-06:00

Days remaining

137

Protocol

TLSv1.3

Cipher

TLS_AES_128_GCM_SHA256

Security headers

0 active

—

HSTSNot 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

Consistent

✓

Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

100.62.15.43, 3.215.11.22, 32.193.126.239, 54.175.2.164

53,99 ms

Cloudflare

1.1.1.1

100.62.15.43, 3.215.11.22, 32.193.126.239, 54.175.2.164

53,09 ms

Quad9

9.9.9.9

100.62.15.43, 3.215.11.22, 32.193.126.239, 54.175.2.164

51,21 ms

OpenDNS

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

aspmx3.googlemail.com

Port 25: Closed/unreachable - 1.3 ms - 
Port 465: Closed/unreachable - 4020.8 ms - 
Port 587: Closed/unreachable - 4021.1 ms -

Recently analyzed domains

View all →

asso.fr4 go.id15 bc.ca4 www.news.bbc.co.uk4 googletagmanager.com66 cloudflare.com94 marktechpost.com77 5starhdporn.com73 apnic.net95 horizont.net78