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Total

DNS

100

Email

Security

Network

100

Availability

Domainncsc.gov.uk

IPv44

IPv60

MX records1

StatusActive

Domain technical report

The National Cyber Security Centre | National Cyber Security Centre

ncsc.gov.uk

The National Cyber Security Centre, a part of GCHQ, helps businesses, the public sector and individuals protect the online services and devices that we all depend on.

Generated: 2026-08-09T02:31:19-05:00 · Cached result

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IPv44

IPv60

MX1

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 propagation0 / 10 pts · Dns

Agreement between public resolvers.

✓

MX records20 / 20 pts · Mail

1 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-RPT5 / 5 pts · Mail

TLS reporting policy.

✓

Valid TLS certificate55 / 55 pts · Security

190 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers16 / 35 pts · Security

4 of 9 evaluated headers detected.

✓

PTR reverse DNS30 / 30 pts · Network

PTR: server-3-166-96-92.mci50.r.cloudfront.net

✓

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)

3.166.96.92
3.166.96.63
3.166.96.71
3.166.96.10

AAAA

0 record(s)

—

Not configured

CNAME

0 record(s)

—

Not configured

MX

1 record(s)

0 ncsc-gov-uk.mail.protection.outlook.com.

TXT

7 record(s)

"apple-domain-verification=XcjoJFjSHOEl1l0x"
"google-site-verification=fVTp_isR1Kujpthr7JeHpEf5sR7UbOjJ-XOUpngXej8"
"atlassian-domain-verification=0YfuEpktsCUA4qzo9up3b7Oc5wMv3wGmMqVsNiuqHY4QKiZ/5AYmSaNLK73IbLLP"
"v=spf1 include:spf.protection.outlook.com -all"
"wLOq0jjevbdDkZ/BEbQZhD5jXcdncT4+h2JkY605uzs="
"google-site-verification=npZLRIpp2M5JRXldE1y_hOb5X7hnfB-34T8osuxyxXE"
"d365mktkey=6979ze2417adit18q17fepsqd"

NS

4 record(s)

ns-1018.awsdns-63.net.
ns-334.awsdns-41.com.
ns-1064.awsdns-05.org.
ns-1863.awsdns-40.co.uk.

SOA

1 record(s)

ns-1064.awsdns-05.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

CAA

7 record(s)

0 issue "globalsign.com"
0 issue "pki.goog"
0 issue "Digicert.com"
0 issue "letsencrypt.org"
0 issue "amazon.com"
0 issue "comodo.com"
0 iodef "mailto:infrastructure@ncsc.gov.uk"

SSHFP

0 record(s)

—

Not configured

SPF

Configured

v=spf1 include:spf.protection.outlook.com -all

DMARC

Configured

v=DMARC1;p=reject;adkim=s;aspf=s;rua=mailto:dmarc-rua@dmarc.service.gov.uk;

DKIM

Selector selector1

v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA0GTZ24ybl4WWeXUleKxwBkjaxICokaniY4Uo1/9bGB+2TVDS374YIzHjgsleTVnpDXrQ1e+V+0c8GZlJqdj5e1OrhNXbkOUHSztywAypaen/AAjEbJWY3ctFyYhlPLJPHN4mbknKkLtt8ZDj6/10ZhGhwUlSvdvBVP9bNbxNfmbaJ1+v7PM03VhPbpyNC3jKAb9q2s3YFRribx4/eexqbm/6LCzn3uSTJ7DM9bKVYapWsZ5yQr3T8FSrpq7qZvOBS3ZnzfmZ2mOhbOwHX325wEx+fsiPLGU3c2Q/f60VrxjQHnWjCmmfZmaCJB4GRxLYohm+Y23LFxJmumwSE2xV8QIDAQAB;

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

The National Cyber Security Centre | National Cyber Security Centre

Description

The National Cyber Security Centre, a part of GCHQ, helps businesses, the public sector and individuals protect the online services and devices that we all depend on.

Final URL

https://www.ncsc.gov.uk/

HTTP status

206

HTTP

Status

HTTP/2 200

Final URL

https://www.ncsc.gov.uk/

Version

Server

cloudflare

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Amazon

ncsc.gov.uk

Valid from

2026-08-01T19:00:00-05:00

Valid until

2027-02-15T17:59:59-06:00

Days remaining

190

Protocol

TLSv1.3

Cipher

TLS_AES_128_GCM_SHA256

Security headers

4 active

✓

HSTSImplemented

—

Content Security PolicyNot detected

✓

X-Content-Type-OptionsImplemented

✓

X-Frame-OptionsImplemented

✓

Referrer PolicyImplemented

—

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

Review

Differences detected

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

13.225.47.116, 13.225.47.37, 13.225.47.62, 13.225.47.80

63,94 ms

Cloudflare

1.1.1.1

13.225.47.116, 13.225.47.37, 13.225.47.62, 13.225.47.80

57,02 ms

Quad9

9.9.9.9

3.166.96.10, 3.166.96.63, 3.166.96.71, 3.166.96.92

48,11 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

ncsc-gov-uk.mail.protection.outlook.com

Port 25: Closed/unreachable - 110.9 ms - 
Port 465: Closed/unreachable - 4056.7 ms - 
Port 587: Closed/unreachable - 4038.1 ms -

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