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

AS4721, JCOM Co., Ltd.

Last update of data:
11-05-2024 07:08 UTC

ASN:

AS4721 (JCN)

Country:

JP - Japan (Asia)

Org.:

JCOM Co., Ltd.

Stats:

Peers

1

IX'es

1

Prefixes

55

IPv4

+631K

IPv6

7,9E+28

Contact:

JCOM Co., Ltd.
JP

History

Date

Peers

IX'es

Prefixes

IPv4

IPv6

Before 20-11-2023

1

1

109

+947K

7,9E+28

20-11-2023

-

-

-54

-316K

-

Current

1

1

55

+631K

7,9E+28

Peers

Country

Relationship

ASN

Organization

Peers

Prefix'es

Japan

Upstream

25

56

Internet eXchange (IX) connections

Country

City

IX name

Port speed

Members

Japan

Tokyo

-

131

Announced (uniq) prefixes

Country

ASN

Announced prefix

Description

Size

Japan

JCOM Co., Ltd.

65.536

Japan

61.203.224.0/19

Japan Network Information Center

8.192

Japan

JCOM Co., Ltd.

4.096

Japan

JCOM Co., Ltd.

4.096

Japan

JCOM Co., Ltd.

2.048

Japan

110.173.240.0/20

JCOM Co., Ltd.

4.096

Japan

JCOM Co., Ltd.

8.192

Japan

110.232.128.0/21

JCOM Co., Ltd.

2.048

Japan

JCOM Co., Ltd.

32.768

Japan

112.137.32.0/20

JCOM Co., Ltd.

4.096

Japan

112.137.64.0/18

JCOM Co., Ltd.

16.384

- - show more (+44 entries) - -

Log

000	+000	Parse input (ASN)
000	+000	Search database for 'AS4721'
003	+002	1 ASN's found
003	+000	Done
003	+000	Load details of AS4721
028	+025	55 prefixes found
031	+003	1 peers found
034	+003	1 IX members found (1 connections)
039	+005	2 historical items loaded
039	+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.