AS10004 AS-PHOENIX-J Phoenix Communications Inc.

AS-PHOENIX-J is Phoenix Communications Inc. (フェニックスコミュニケーションズ), an internet provider headquartered in Chuo-ku, Sapporo, Hokkaido. It sells fibre, fixed-wireless (BWA) and VoIP under the PHOENIX CLUB / PXC brand, and also supplies backbone and address space to a set of affiliated regional operators.

What it's used for

Broadband access. The AS announces 11 IPv4 prefixes totalling 26,368 addresses and a single IPv6 /32, and every sampled address resolves into an access-network pattern: 210-185-144-005.rppp.jp and H05.N80b9d2.rppp.jp encode the address straight into the label, 133-247-128-5.nctv.co.jp is cable-subscriber naming, and Pa5.kwn.yamasemi.ne.jp is a session-concentrator name. Those per-address PTRs exist to give customer-premises equipment a hostname in bulk. Backbone, server and management space does not look like that.

Notable

An eyeball network, and the neighbour count agrees: 26,368 addresses against 23 observed BGP neighbours is an access ISP with a few upstreams and regional peering, not a wholesale carrier — a transit business of that size would carry hundreds of adjacencies.

Interesting

The rDNS spans several different company zones — rppp.jp, nctv.co.jp, yamasemi.ne.jp (CBBS Corporation), plus Phoenix's own phoenix-c.or.jp. That is not the address-broker silhouette; it is the shape of Phoenix's stated wholesale business, supplying connectivity and numbering to partner ISPs, cable operators and the Hokkaido broadband cooperative. Geolocate this space to Japanese households behind those retail brands, not to Phoenix's Sapporo office.