AS17529 — MediaCat - STARCAT Co .,LTD.

AS17529 announces 12 IPv4 prefixes covering 135,424 addresses and 1 IPv6 prefixes.

About this network

MEDIACAT STARCAT CABLE NETWORK Co .,LTD. is the AS handle for Starcat, a Japanese cable television and internet service provider.

What it's used for

• The address space carries residential user traffic, evidenced by reverse DNS entries such as h180-200-032-000.user.starcat.ne.jp and h058-146-016-000.user.starcat.ne.jp.
• The AS announces 135424 IPv4 addresses across 12 prefixes and 1 IPv6 prefix, while maintaining only 2 observed neighbours, a ratio characteristic of an access network rather than a transit provider.

Notable

• Registrants for the majority of prefixes are listed as Japan Network Information Center with netnames MEDIACAT-CIDR-BLK-JP or STARCAT, consistent with the announcer's identity.
• The inventory includes a mix of large /17 and /18 blocks alongside smaller /19, /20, and /24 allocations, with one prefix carrying the netname SC-SCHOOL.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 58.146.0.0/18
• 58.146.64.0/19
• 61.211.128.0/20
• 61.213.192.0/20
• 120.138.128.0/18
• 124.241.128.0/18
• 125.58.64.0/18
• 180.200.0.0/17
• 193.115.32.0/19
• 203.91.160.0/19
• 211.128.16.0/20
• 219.100.227.0/24
• 2001:3b0::/32

Upstream networks

• AS9354 Community Network Center Inc.
• AS2497 Internet Initiative Japan Inc.

Adjacent networks

• AS9354 Community Network Center Inc.
• AS2497 Internet Initiative Japan Inc.

Routing security

• RPKI: 14 valid, 0 invalid and 0 not-found announcements; 15 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 31 route objects.
• Listed in as-sets: AS-ANC, AS-BBIX-T, AS-BBIX-T-V6, AS-CNCI, AS-CNCI, AS-GIGAINFRA-V6, AS-HURRICANEV6, AS-IIJ, AS-IIJ6, AS-IPV6_VECTANT, AS-KDD, AS-KDDCUSTOMER2, AS-KDDI6, AS-MEDIACAT, AS-MESH-CUSTOMER:AS9354, AS-PACNET, AS-PACNET-CUSTOMER-PROXY-REGISTER, AS-PACNET-DOWNSTREAM-JP, AS-TELSTRA-INTL-CUSTOMERS, AS-VECTANT, AS-XO-B, AS2497:AS-IIJ, AS2497:AS-IIJ6.