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

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.

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

204.131.0.0/16

Prefix:

204.131.0.0/16 (65.536 IP's - view in CIDR to IP tool)

Description:

CenturyLink Communications, LLC

Country:

United States

Announced by:

CenturyLink Communications, LLC
https://www.lumen.com

AS209, 779 peers, 369 announced prefixes

See all details on AS209 - CenturyLink Communications, LLC »

Matching prefixes

Country

ASN

Announced prefix

Description

Size

United States

CenturyLink Communications, LLC

65.536

United States

204.131.46.0/24

GRAND COUNTY INTERNET SERVICES, INC.

256

United States

204.131.48.0/24

GRAND COUNTY INTERNET SERVICES, INC.

256

United States

204.131.68.0/24

NAROPA UNIVERSITY

256

United States

204.131.163.0/24

ADAMS BANK & TRUST

256

United States

204.131.192.0/24

Cage Cube Technologies, Inc.

256

United States

204.131.222.0/24

-

256

United States

204.131.236.0/24

Wyoming Wireless Internet

256

Log

000	+000	Parse input (Prefix)
000	+000	Search database for '204.131.0.0/16'
014	+014	8 prefixes found
014	+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.