ResearchRouting table, RPKI, IRR & looking glass

AS4721 JCOM Co., Ltd.

AS4721 (JCN) is registered to JCOM Co., Ltd. in JP. It originates 163 prefixes in the global routing table.

162
IPv4 prefixes
1
IPv6 prefixes
631,808
IPv4 addresses
100%
RPKI valid
Registration

Who holds AS4721

Names from RIPE NCC’s daily list of every allocated AS number. The ASN lookup fetches the full WHOIS record live.

AS number
AS4721
Handle
JCN
Organization
JCOM Co., Ltd.
Country
JP
ASPA
None published
Routing

What AS4721 announces

Prefixes originated by AS4721 in the RouteViews table (refreshed every four hours), each checked against the RPKI (every ten minutes) and the IRR (daily).

IPv4 prefixes
162
IPv6 prefixes
1
IPv4 addresses
631,808 (2,468 /24s)
RPKI valid
163 100%
RPKI invalid
0
RPKI not found
0
ROAs naming AS4721
57
With an IRR route object
163 100%
Prefixes

Announced prefixes

Each opens its own page: who announces it, the paths our collectors see, its ROAs and route objects.

IPv4 (162)
14.193.0.0/1614.193.0.0/1714.193.128.0/1761.203.224.0/1961.203.224.0/2061.203.240.0/20110.4.48.0/20110.4.48.0/21110.4.56.0/21110.92.80.0/20110.92.80.0/21110.92.88.0/21110.93.0.0/21110.93.0.0/22110.93.4.0/22110.173.240.0/20110.173.240.0/21110.173.248.0/21110.232.0.0/19110.232.0.0/20110.232.16.0/20110.232.128.0/21110.232.128.0/22110.232.132.0/22111.90.0.0/17111.90.0.0/18111.90.64.0/18112.137.32.0/20112.137.32.0/21112.137.40.0/21112.137.64.0/18112.137.64.0/19112.137.96.0/19113.52.16.0/20113.52.16.0/21113.52.24.0/21113.61.112.0/20113.61.112.0/21113.61.120.0/21114.134.112.0/20114.134.112.0/21114.134.120.0/21114.134.192.0/18114.134.192.0/19114.134.224.0/19114.142.128.0/21114.142.128.0/22114.142.132.0/22114.198.192.0/19114.198.192.0/20114.198.208.0/20114.198.224.0/21114.198.224.0/22114.198.228.0/22115.42.96.0/20115.42.96.0/21115.42.104.0/21116.70.128.0/18116.70.128.0/19116.70.160.0/19118.83.0.0/16118.83.0.0/17118.83.128.0/17118.86.0.0/15118.86.0.0/16118.87.0.0/16122.255.128.0/17122.255.128.0/18122.255.192.0/18123.98.224.0/19123.98.224.0/20123.98.240.0/20175.41.64.0/18175.41.64.0/19175.41.96.0/19175.103.12.0/22175.103.12.0/23175.103.14.0/23180.92.32.0/19180.92.32.0/20180.92.48.0/20180.149.160.0/19180.149.160.0/20180.149.176.0/20182.50.192.0/19182.50.192.0/20182.50.208.0/20182.50.224.0/20182.50.224.0/21182.50.232.0/21202.43.16.0/20202.43.16.0/21202.43.24.0/21202.43.68.0/22202.43.68.0/23202.43.70.0/23202.72.64.0/20202.72.64.0/21202.72.72.0/21202.78.176.0/20202.78.176.0/21202.78.184.0/21202.83.184.0/21202.83.184.0/22202.83.188.0/22202.178.80.0/20202.178.80.0/21202.178.88.0/21203.89.32.0/19203.89.32.0/20203.89.48.0/20203.114.248.0/22203.114.248.0/23203.114.250.0/23203.124.64.0/19203.124.64.0/20203.124.80.0/20203.153.56.0/22203.153.56.0/23203.153.58.0/23
Show 42 more
210.135.192.0/19210.135.192.0/20210.135.208.0/20210.172.240.0/20210.172.240.0/21210.172.248.0/21211.19.208.0/20211.19.208.0/21211.19.216.0/21218.219.80.0/20218.219.80.0/21218.219.88.0/21219.112.192.0/19219.112.192.0/20219.112.208.0/20219.113.96.0/20219.113.96.0/21219.113.104.0/21219.117.0.0/20219.117.0.0/21219.117.8.0/21219.117.160.0/19219.117.160.0/20219.117.176.0/20219.124.224.0/19219.124.224.0/20219.124.240.0/20220.208.64.0/18220.208.64.0/19220.208.96.0/19221.132.128.0/18221.132.128.0/19221.132.160.0/19223.165.20.0/22223.165.20.0/23223.165.22.0/23223.165.32.0/19223.165.32.0/20223.165.48.0/20223.223.208.0/21223.223.208.0/22223.223.212.0/22
IPv6 (1)
2001:c30::/32

RPKI valid   RPKI invalid   no ROA covers it

Neighbors

Who AS4721 is reached through

The AS just before AS4721 in the paths our looking glass collectors hold, for 60 of its prefixes. Usually a transit provider, sometimes a peer. The number is how many of those prefixes it was seen on.

AS9824 JTCL-JP-AS 60
IRR

Routing registry objects

From the mirrored IRR databases (RADB, the five RIRs and more). Look it up live.

Sourceas-nameMaintained by
RADBJCNMAINT-AS9824

Route objects with origin AS4721: RADB 173 · JPIRR 163

as-sets that list AS4721 (19)
AS-9824TRANSITAS-9824TRANSIT6AS-ANCAS-HURRICANEV6AS-IIJAS-IIJ6AS-IPV6_VECTANTAS-KDDAS-KDDI6AS-LEVEL3-ORIGINS-NAAS-PACNETAS-PACNET-CUSTOMER-PROXY-REGISTERAS-PACNET-DOWNSTREAM-JPAS-TMNET-PEERSAS-VCECTANTAS-VECTANTAS-XO-BAS2497:AS-IIJAS2497:AS-IIJ6
Tools

Check AS4721 live

ASN lookup and WHOISRPKI validatorASPA validatorIRR lookup