subnet.im

AS7521INTERNET MULTIFEED CO.

JapanRegistryAPNIC

As of 29th September 2026, AS7521 (INTERNET MULTIFEED CO.), a network registered in Japan with APNIC, originates 8 IPv4 prefixes covering 4.9k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 15,857th-largest of the 79,607 networks we see originating IPv4, and the 393rd-largest of 729 in Japan. It is seen behind 1 upstream network, most often AS55391 (INTERNET MULTIFEED CO.), and in front of 6 downstream networks. Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers, and 1 prefix is also originated by another network.

At a glance

IPv4 prefixes

8

IPv6 prefixes

1

IPv4 addresses

4.9k

IPv6 /64s

4.3B

Upstream graph

The networks AS7521 is seen behind, one and two hops out, drawn from real AS paths.

AS7521Toward the internet core
Upstream graph for AS7521: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS7521INTERNET MULTIFEE…This networkAS55391INTERNET MULTIFEE…AS2497Internet Initiati…AS6939Hurricane Electri…

Networks observed one and two hops upstream of AS7521 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

14

adjacent networks

Upstreams
17%
Peers
750%
Downstreams
643%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS7521
NetworkCountryRelationshipPathsVantage pts
AS55391INTERNET MULTIFEED CO.JPPeer2,578147

Prefixes

The largest blocks AS7521 originates, widest first.

Largest prefixes originated by AS7521
PrefixAddressesVisibility
210.173.160.0/212k81/82
210.173.180.0/221k81/82
210.173.186.0/2351281/82
115.69.237.0/2425676/82
210.173.168.0/2425681/82
210.173.170.0/2425681/82
210.173.172.0/2425681/82
210.173.178.0/2425680/82
2001:3a0::/324.3B × /6465/65

Routing health

How AS7521's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid100.0%9
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%9
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 8 prefixes

IPv6 — 1 prefixes

  • /324.3B × /64100.0%1

Recent changes

Announcements that started or stopped since 30th Aug 2026.

No announcement by AS7521 started or stopped in this period.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.