4721 --No Registry Entry--
Adjacency: 6 Upstream: 1 Downstream: 5
Upstream Adjacent AS list
AS4716 --No Registry Entry--
Downstream Adjacent AS list
AS18075 JPNIC-ASBLOCK-AP JPNIC
AS23788 --No Registry Entry--
AS24255 --No Registry Entry--
AS23790 --No Registry Entry--
AS18092 JPNIC-ASBLOCK-AP JPNIC
Rank AS Type Originate Addr Space (pfx) Transit Addr space (pfx) Description 1095 AS4721 ORG+TRN Originate: 149504 /14.81 Transit: 70912 /15.89 --No Registry Entry--
Aggregation Suggestions
Filter: Aggregates, Specifics
This report does not take into account conditions local to each origin AS in terms of policy or traffic engineering requirements, so this is an approximate guideline as to aggregation possibilities.
Rank AS AS Name Current Wthdw Aggte Annce Redctn % 4448 AS4721 --No Registry Entry-- 22 2 1 21 1 4.55% Prefix AS Path Aggregation Suggestion 61.203.224.0/19 4637 4716 4721 122.255.128.0/18 4637 4716 4721 123.98.224.0/20 4637 4716 4721 202.43.16.0/20 4637 4716 4721 202.72.64.0/20 4637 4716 4721 202.78.176.0/20 4637 4716 4721 202.83.184.0/21 4637 4716 4721 202.178.80.0/20 4637 4716 4721 203.89.32.0/19 4637 4716 4721 203.124.64.0/19 4637 4716 4721 210.135.192.0/19 4637 4716 4721 + Announce - aggregate of 210.135.192.0/20 (4637 4716 4721) and 210.135.208.0/20 (4637 4716 4721) 210.135.192.0/20 4637 4716 4721 - Withdrawn - aggregated with 210.135.208.0/20 (4637 4716 4721) 210.135.208.0/20 4637 4716 4721 - Withdrawn - aggregated with 210.135.192.0/20 (4637 4716 4721) 210.172.240.0/20 4637 4716 4721 211.19.208.0/20 4637 4716 4721 218.219.80.0/20 4637 4716 4721 219.112.192.0/19 4637 4716 4721 219.113.96.0/20 4637 4716 4721 219.117.0.0/20 4637 4716 4721 219.117.160.0/19 4637 4716 4721 219.124.224.0/19 4637 4716 4721 220.208.64.0/18 4637 4716 4721 221.132.128.0/18 4637 4716 4721
Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.
AS4721 12 More Specifics 26 Total Advertisements --No Registry Entry--
61.203.224.0/19 61.200.0.0/13
210.135.192.0/20 210.128.0.0/13
210.135.208.0/20 210.128.0.0/13
210.172.240.0/20 210.160.0.0/12
211.19.208.0/20 211.16.0.0/14
218.219.80.0/20 218.216.0.0/13
219.112.192.0/19 219.96.0.0/11
219.113.96.0/20 219.96.0.0/11
219.117.0.0/20 219.96.0.0/11
219.117.160.0/19 219.96.0.0/11
219.124.224.0/19 219.96.0.0/11
220.208.64.0/18 220.208.0.0/12
whois: 402332
IANA has recorded AS4721 as originally allocated by
/usr/bin/whois -h jwhois.apnic.net -r "AS4721\n % [whois.apnic.net]
% Whois data copyright terms http://www.apnic.net/db/dbcopyright.html
% Information related to 'AS4608 - AS4865'
as-block: AS4608 - AS4865
descr: APNIC ASN block
remarks: These AS numbers are further assigned by APNIC
remarks: to APNIC members and end-users in the APNIC region
admin-c: HM20-AP
tech-c: HM20-AP
mnt-by: APNIC-HM
mnt-lower: APNIC-HM
last-modified: 2019-05-20T03:52:26Z
source: APNIC
% Information related to 'AS4683 - AS4735'
as-block: AS4683 - AS4735
descr: JPNIC-2Byte-ASBLOCK-AP
descr: for assignment to JPNIC members
country: JP
admin-c: JNIC1-AP
tech-c: JNIC1-AP
remarks: Authoritative information regarding AS Number
remarks: assignments made from within this block can be
remarks: queried at whois.nic.ad.jp.
remarks: To only display English output,
remarks: add '/e' at the end of command,
remarks: e.g. 'whois -h whois.nic.ad.jp xxx/e'.
mnt-by: APNIC-HM
mnt-lower: MAINT-JPNIC
last-modified: 2023-08-28T04:50:39Z
source: APNIC
% Information related to 'AS4721'
aut-num: AS4721
as-name: JCN
descr: JCOM Co., Ltd.
import:
export:
country: JP
admin-c: JP00124485
tech-c: JP00124485
last-modified: 2022-02-18T01:33:18Z
remarks: This information has been partially mirrored by APNIC from
remarks: JPNIC. To obtain more specific information, please use the
remarks: JPNIC WHOIS Gateway at
remarks: http://www.nic.ad.jp/en/db/whois/en-gateway.html or
remarks: whois.nic.ad.jp for WHOIS client. (The WHOIS client
remarks: defaults to Japanese output, use the /e switch for English
remarks: output)
source: JPNIC
% This query was served by the APNIC Whois Service version 1.88.48 (WHOIS-AU4)