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

AS139903, RETN Telecoms Ltd.

Last update of data:
16-04-2024 12:34 UTC

ASN:

AS139903 (RETN-AS-AP)

Country:

TW - Taiwan (Asia)

Org.:

RETN Telecoms Ltd.
https://www.retn.net
Social media: @facebook @twitter/X @linkedin

Stats:

Peers

2

IX'es

-

Prefixes

2

IPv4

512

IPv6

1,2E+24

Contact:

RETN Telecoms Ltd.
7F.-3, No.103, Sec. 2, Zhongshan N. Rd., Zhongshan Dist, Taipei
TW

+886-2-2511-0013

History

Date

Peers

IX'es

Prefixes

IPv4

IPv6

Before 26-12-2023

1

-

2

512

1,2E+24

26-12-2023

+1

-

-

-

-

Current

2

-

2

512

1,2E+24

Peers

Country

Relationship

ASN

Organization

Peers

Prefix'es

Britain (UK)

Upstream

3.280

32

Russia

Upstream

896

5

Announced (uniq) prefixes

Country

ASN

Announced prefix

Description

Size

Taiwan

103.146.250.0/23

RETN Telecoms Ltd.

512

Country

ASN

Announced prefix

Description

Size

Taiwan

2001:df2:7580::/48

RETN Telecoms Ltd.

1,2E+24

Log

000	+000	Parse input (ASN)
000	+000	Search database for 'AS139903'
005	+005	1 ASN's found
005	+000	Done
005	+000	Load details of AS139903
019	+014	2 prefixes found
032	+013	2 peers found
036	+003	No matching IX connections found!
043	+007	4 links loaded, 4 verified
045	+002	2 historical items loaded
045	+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.