AS290

AS290 is an ARIN-registered legacy autonomous system number that backs ShowNet, the live demonstration network built each year for the Interop Tokyo trade show at Makuhari Messe in Chiba, Japan. The ASN's defining trait is that it is event-only: it sits idle in the global routing table for most of the year and is brought up briefly during the annual exhibition to provide internet connectivity to exhibitor booths and to demonstrate multi-vendor interoperability. As of 2026-06-25 it is not announced — RIPEstat shows 0 of 325 IPv4 RIS peers and 0 of 323 IPv6 RIS peers seeing it, and CAIDA records a singleton customer cone (1 ASN, 0 prefixes, 0 addresses) with zero observed BGP neighbours, placing it at CAIDA AS rank 79,459. A short transient announcement window (2026-06-11 16:00 to 2026-06-12 08:00 UTC) carried four prefixes — 202.17.220.0/23, 45.0.0.0/16, 130.128.0.0/15 and 2001:3e8::/32 — consistent with the show being temporarily active, then withdrawn. ShowNet has run since 1994 as a flagship proof-of-interoperability effort, staffed annually by roughly 400 volunteer engineers from academia and industry. PeeringDB lists an Open peering policy and presence at eight Asia-Pacific IXPs (BBIX Hong Kong/Singapore/Tokyo, JPNAP Tokyo, JPIX Tokyo, DIX-IE, JCIX, ENTERNET IX) with IRR record RADB::AS-SHOWNET. The ARIN registrant address is in Burlingame, California — a vestige of the historical US Interop organization — while the operational network today runs in Japan, organized by NANO OPT Media, Inc. No notable public abuse signal was found as of 2026-06-25 (no Spamhaus ASN-DROP listing, no NANOG incident thread, no threat-intel attribution); bgp.he.net's bogon flag is a routing-data artifact typical of experimental exhibition networks, not evidence of abuse.

Operator

Interop Show Network (ARIN handle ISN-4); event organized by NANO OPT Media, Inc., Tokyo; network branded ShowNet [Confirmed] — rdap.arin.net/registry/autnum/290, nanooptmedia.jp/en

Country / RIR

US, ARIN [Confirmed] — rdap.arin.net/registry/autnum/290; RIPEstat abuse-contact-finder (authoritative_rir: arin)

Allocated

1990-07-17 (ARIN RDAP autnum top-level registration event); last changed 2021-09-21 [Confirmed] — rdap.arin.net/registry/autnum/290

AS name

SHOWNET-AS [Confirmed] — RIPEstat as-overview (holder: SHOWNET-AS - Interop Show Network), CAIDA AS Rank

Org status

ASN registration active with ARIN (status ok); ARIN registrant 1325 Howard Ave #414, Burlingame, CA 94010 (historical US Interop entity); event operated by NANO OPT Media, Inc. (Tokyo, founded 2000-02-28). Network is seasonal/temporary, active only during Interop Tokyo [Confirmed for registration/RIR; Likely for organizer details] — rdap.arin.net/registry/autnum/290, peeringdb.com/asn/290, nanooptmedia.jp/en

Contacts

NOC as-shownet@interop-tokyo.jp (role mailbox); the RIPEstat abuse-finder additionally returns four individual mailboxes at consulting and Interop domains, withheld here — consult the ARIN RDAP / RIPEstat records directly [Confirmed for abuse via RIPEstat; Likely for NOC via PeeringDB] — RIPEstat abuse-contact-finder, peeringdb.com/asn/290

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-25 — no Spamhaus ASN-DROP listing, no NANOG incident thread, no AbuseIPDB/threat-intel attribution; CleanTalk ASN page exists with no elevated metrics; bgp.he.net bogon flag is an artifact of the network's experimental character

Network & routing

Network type

enterprise per PeeringDB; in practice a temporary, event-based demonstration network deployed annually for Interop Tokyo [Confirmed] — peeringdb.com/asn/290, interop.jp/2026/en/shownet

Size

dormant most of the year — 0 IPv4 prefixes / 0 addresses, 0 IPv6 prefixes; customer cone = singleton (1 ASN, 0 prefixes, 0 addresses); a 2026-06-11→06-12 transient window carried 202.17.220.0/23, 45.0.0.0/16, 130.128.0.0/15, 2001:3e8::/32

[Confirmed] — RIPEstat routing-status / announced-prefixes, CAIDA AS Rank

Routing/peering

NOT announced as of 2026-06-25 — 0/325 v4 RIS peers, 0/323 v6 RIS peers; CAIDA degree total 0 (customer 0, peer 0, provider 0), 0 observed neighbours [Confirmed]. PeeringDB lists an Open policy (no contract/ratio requirement, IPv4+IPv6, no route servers) across 8 IXPs (BBIX HK/SG/Tokyo, JPNAP Tokyo, JPIX Tokyo, DIX-IE, JCIX, ENTERNET IX)

[Confirmed] — peeringdb.com/asn/290

RPKI

not assessable — no active prefix to validate at query time [Unknown] — RIPEstat rpki-validation (skipped, no prefix)

Notable usage

ShowNet is the live demonstration network at Interop Tokyo, operating since 1994 with ~400 volunteer engineers; the 2025 instance involved 828 participants and demonstrated SRv6/segment routing, 5G integration and broadcast video transmission. IRR record RADB::AS-SHOWNET [Confirmed for ShowNet identity/IRR; Likely for 2025 participant figures] — interop.jp/2025/shownet, peeringdb.com/asn/290

Geographic scope

Asia-Pacific (per PeeringDB); operational network runs entirely in Japan (Makuhari Messe), despite US ARIN registrant address [Confirmed] — peeringdb.com/asn/290, rdap.arin.net/registry/autnum/290

Upstream (single source)

one community source reports single-homing to AS2516 (KDDI) [Likely] — bgp.he.net/AS290, ipinfo.io/AS290

First/last seen routing

first observed 2000-09-01 (192.16.170.0/24); last seen 2026-06-12 (202.17.220.0/23) [Confirmed] — RIPEstat routing-status

Analyst note

Encountered as an event-only ASN — dormant the rest of the year, briefly announced during Interop Tokyo. Legitimate, well-documented demonstration network; clean abuse profile.