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Domain report

postcodes.io

postcodes.io ranks in the top 0.30% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 3 distinct hosts observed under it.

Explore postcodes.io in the Web Graph

Connectivity

#402,194harmonic-centrality rank
Top percentile
0.30%
Hosts observed
3

From the Common Crawl cc-main-2026-jul-aug-sep hyperlink graph, 133,241,980 domains total. What this rank means

HTTPS reachability

200HTTP status

https://postcodes.io/ answered with HTTP 200.

DNS records

A
  • 104.26.13.209
  • 104.26.12.209
  • 172.67.71.82
AAAA
  • 2606:4700:20::681a:dd1
  • 2606:4700:20::681a:cd1
  • 2606:4700:20::ac43:4752
MX
  • 10 aspmx.l.google.com.
  • 20 alt1.aspmx.l.google.com.
  • 20 alt2.aspmx.l.google.com.
  • 30 aspmx2.googlemail.com.
  • 30 aspmx3.googlemail.com.
NS
  • nia.ns.cloudflare.com.
  • wesley.ns.cloudflare.com.
AS
Server in network CLOUDFLARENET, AS13335 · United States104.26.13.0/24, which holds 104.26.13.209

Live preview

This is a live, sandboxed embed of postcodes.io — not a copy. What it shows can change any time the site itself does.

Domain registration (WHOIS / RDAP)

No RDAP (WHOIS) data is available for postcodes.io.

How to read WHOIS and RDAP data

SSL certificate

Certificate Transparency lookup failed (HTTP 429).

How to check when a certificate expires

HTTP & security headers

Response

Server
cloudflare
Content-Type
text/html; charset=utf-8
Cache-Control
public, max-age=0
Content-Encoding
Not sent

Security

Content-Security-Policy
Not sent
Strict-Transport-Security
Not sent
X-Frame-Options
Not sent
X-Content-Type-Options
Not sent
Referrer-Policy
Not sent
Permissions-Policy
Not sent

What each security header does

Redirect chain

  1. 1.http://postcodes.io/HTTP 200

Meta tags

Title
Postcode & Geolocation API for the UK | Postcodes.io
Description
Search, validate and geolocate UK postcodes. Retrieve the latest administrative and geospatial information for postcodes
Canonical
https://postcodes.io/
Robots
Not set
Generator
Docusaurus v3.9.2
Open Graph title
Postcode & Geolocation API for the UK | Postcodes.io
Open Graph description
Search, validate and geolocate UK postcodes. Retrieve the latest administrative and geospatial information for postcodes
Open Graph image
https://postcodes.io/img/postcodesio.png
Open Graph type
Not set
Twitter card
summary_large_image
Twitter title
Not set
Twitter image
https://postcodes.io/img/postcodesio.png

robots.txt

postcodes.io has no robots.txt.

Technology detected

Best-effort, based on a small set of well-known signals — this may be incomplete.

  • Cloudflarecdn

    Server: cloudflare

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Domains ranked just above and below it in the same snapshot.