ref.co

Get an email when its DNS, website or certificate changes.

ref.co serves a website of its own over HTTPS and under www. It answers on IPv4 only, with a valid TLS certificate.

626,814 other domains share an IP address with it.

The most recent crawl returned the page title “Ref.co - Your AI Visibility, Crystallized” and 80,661 bytes of HTML.

Domain properties

Property	Value	Explanation
Top-level domain	.co	Statistics for all domains we know under this TLD.
Has website	yes	A website is hosted under the domain, which does not redirect to an external domain.
Has MX-record	no	The domain has an MX record.
External redirect	no	The domain redirects to another domain.
Redirect to https	yes	The domain redirects to https.
Redirect to www.	yes	The domain redirects to www.domain.
Only with www.	no	The domain can only be reached with the subdomain "www".
Only DNS, no website	no	There are no A or AAAA records in DNS.
IP-Address	only IPv4	Shows whether the domain only has IPv4 or IPv6 or both.
SSL-Certificate	valid	Shows whether the domain has a valid SSL certificate.
Redirects	0	Number of domains that redirect to this domain.
Reverse IP	626,814	Number of domains with the same IP(s).

This data through the API

The data on this page is also available as JSON: /lookup for the key facts, /reverseip, /redirect and /similar for the lists, and /dnshistory with Basic and Premium. A free account comes with an API key and 100 calls a day.

curl -X POST https://api.webxtrend.com/v1.0/lookup \
  -H 'Content-Type: application/json' \
  -d '{"token": "YOUR_TOKEN", "query": "ref.co"}'

Create a free account Read the API docs

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Websites whose start page offers something similar, found by comparing the text of their start pages, across languages. Near-identical copies, parking pages and error pages are left out. The full list of up to 100 comes through the API: similar websites.

Last SSL certificate

Issuer	Let's Encrypt
Valid from	8/5/2026
Valid to	11/3/2026
Time until expiry	14 days

Last successful crawl

Title	Ref.co - Your AI Visibility, Crystallized
Description	The all-in-one GEO & AI Visibility platform to audit, optimize and monitor every aspect of your brand's performance in AI search.
Content-Length	80,661 bytes

Title and description as published by the page itself in its own <title> and <meta name="description"> tags.

DNS history

IPv4 address	Last updated
216.150.1.1	2/2/2026
104.21.69.214	12/18/2025
172.67.213.95	12/18/2025
188.114.96.0	12/6/2025
188.114.97.0	12/6/2025

IPv6 address	Last updated
2606:4700:3035:0:0:0:ac43:d55f	12/18/2025
2606:4700:3037:0:0:0:6815:45d6	12/18/2025
2a06:98c1:3120:0:0:0:0:0	12/6/2025
2a06:98c1:3121:0:0:0:0:0	12/6/2025
2606:4700:3035:0:0:0:ac43:d55f	11/11/2025

Mail server	Priority	Last updated
localhost	0	1/1/2024

Name server	Last updated
art.ns.cloudflare.com	10/25/2025
jamie.ns.cloudflare.com	10/25/2025
ns1.sedoparking.com	12/17/2023
ns2.sedoparking.com	12/17/2023

The five most recent states of each record type. The full history comes through the API: DNS history.

Most recent redirect domains

No domains found.

Reverse IP neighbours

216.150.1.1 626,814 domains · here since 9/14/2026

Domain	On this IP since
zzzzhub.xyz	10/19/2026
zzzsg.com	10/17/2026
zzzpost.com	9/28/2026
zzzip.kr	10/8/2026
zzz.toys	9/23/2026
zzz.bingo	10/12/2026
zzz.art	10/8/2026
zzxgim.com	9/16/2026
zztbsw.info	10/4/2026
zzpzt.cn	9/14/2026
zzpwerkvinden.nl	9/15/2026
zzppy.nl	9/16/2026
and 626,801 more

Sharing an address does not always mean sharing a server: on a CDN or a large hosting platform, millions of unrelated domains answer on the same few addresses. We measured how far that goes in Half the web sits on 276 IP addresses. The complete list of neighbours, also for an IP address, comes through the API: reverse IP lookup.

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