ASN database

You may find these sub-pages interesting as well:

Related tools

DNS lookup / nslookup / DIG of DNS records. An online tool for DNS lookups. By default recursive lookups querying the authoritative name servers. Lookups on specific DNS resolvers are also possible. Additionally, it will look up secondary records and output a full log of what was done on a technical level.

WHOIS / RDAP lookup

Perform WHOIS and/or RDAP lookups on domains, IP addresses, and ASNs. Will output all available technical info, contact info, etc.

Perform reverse DNS (rDNS/PTR) lookups of any IP.

CIDR calculator

IP to CIDR calculation tool with subnet info. The reverse, CIDR ranges to IP addresses, is also possible. Last but not least, it includes a tool for refactoring groups of IPs, domain names, and/or other CIDR ranges.

What is my IPv4 and IPv6?

Check your own IP - both IPv4 and IPv6. Works as a connectivity test as well.

Online tool GeoIP location of any IP and/or domain.

World map, day/night + local time

Beautiful day/night map of the world, with markup of all major cities including local date and time.

Result

AS204018, Cityfibre Limited

Last update of data:
19-04-2024 17:14 UTC

ASN:

AS204018 (Cityfibre)

Country:

GB - Britain (UK) (Europe)

Org.:

Cityfibre Limited
https://www.cityfibre.com
Social media: @linkedin @facebook @twitter/X

Stats:

Peers

1

IX'es

-

Prefixes

1

IPv4

256

IPv6

-

Contact:

Cityfibre Limited
15 Bedford Street
WC2E 9HE
London
UNITED KINGDOM
GB

+448452930774

Peers

Country

Relationship

ASN

Organization

Peers

Prefix'es

United States

Upstream

Level 3 Parent, LLC

6.668

791

Announced (uniq) prefixes

Country

ASN

Announced prefix

Description

Size

Britain (UK)

156.67.240.0/24

Cityfibre Limited

256

Log

000	+000	Parse input (ASN)
000	+000	Search database for 'AS204018'
003	+003	1 ASN's found
003	+000	Done
003	+000	Load details of AS204018
013	+011	1 prefixes found
017	+003	1 peers found
019	+003	No matching IX connections found!
022	+003	4 links loaded, 4 verified
024	+002	1 historical items loaded
024	+000	Done

Changelog

Newsletter

Bi-weekly (at most) with updates, changelog and info from the website. Just straight to the point info - no BS! Sign up right here, or read more about the iamroot.tech newsletter.

Signup using Google

Signup using Github

Other options: Signup using Microsoft or Signup using Facebook.

OR

No personal information gathered anywhere. E-mail may be used for login and/or newsletter - will not be sold or used by anyone else but iamroot.tech. Cookies are in use for statistical and useability purposes. Trademarks property of their respective owners. A privacy policy and terms and conditions is availible if you like.

iamrootdottech@gmail.com
Bundgaard - Løvenørnsgade 56, 2tv - DK-8700 Horsens - Denmark

Shoutouts and credits to: Bootstrap, jQuery, Bootstrap live customizer by Virtuosoft, DnsClient.NET by MichaCo, LazyLoad by Mika Tuupola, the Olson tz database by IANA, Visible earth by NASA, GeoLite2 by MaxMind, Barcoder by Wouter Huysentruit, ICONS8.
json-viewer by alenaksu.

iamrootdottech@gmail.com
Bundgaard - Løvenørnsgade 56, 2tv - DK-8700 Horsens - Denmark

No personal information gathered anywhere. E-mail may be used for login and/or newsletter - will not be sold or used by anyone else but iamroot.tech. Cookies are in use for statistical and useability purposes. Trademarks property of their respective owners. A privacy policy and terms and conditions is availible if you like.