AS280

AS280 is a legacy 16-bit autonomous system number registered under ARIN to NTT America, Inc., the U.S. arm of the NTT Group's Global IP Network (GIN). The key triage point for AS280 is that it is dormant: every routing source consulted (RIPEstat, Hurricane Electric, IPInfo) agrees it announces zero IPv4 and zero IPv6 prefixes today, has zero observed BGP neighbours, and has been dark in the global routing table since the end of 2023. RIPEstat's as-overview endpoint explicitly returns announced: false as of 2026-06-21, with 0 RIS peers seeing it out of 327 IPv4 and 324 IPv6 full-feed peers. The ARIN RDAP autnum record gives a top-level registration date of 2000-03-29 and a last-changed date of 2012-03-02, placing AS280 in NTT America's early allocation pool. Historically the ASN originated seven IPv4 /24s in the 45.112.144.0/24–45.112.150.0/24 range; Hurricane Electric carries a stale bogon annotation for that block, but it is a routing-table artifact rather than active malicious activity. NTT America's operationally active Tier-1 transit and peering runs under AS2914 (the GIN backbone), which has its own PeeringDB record and Selective peering policy; AS280 has no separate PeeringDB entry. RPKI posture is not assessable because there are no active originations and therefore no ROAs. No notable public abuse signal was found as of 2026-06-21 — not in Spamhaus, AbuseIPDB, NANOG archives, or any threat-intelligence feed searched — consistent with a clean, dormant ASN held by a respected Tier-1 operator.

Operator

NTT America, Inc. (ARIN handle NTTA-280; org handle NTTAM-1; private subsidiary within the NTT Group) [Confirmed] — ARIN RDAP, bgp.he.net/AS280

Country / RIR

United States, ARIN [Confirmed] — ARIN RDAP autnum, RIPEstat as-overview (IANA 16-bit block 1–1876, assigned by ARIN)

Allocated

2000-03-29 (ARIN RDAP autnum top-level registration event — a first-party RIR fact, NOT an IEEE date); last changed 2012-03-02 [Confirmed] — ARIN RDAP autnum top-level events (A3 parsed the true top-level events with fetch-canonical.mjs; the 2005/2006 dates seen in the truncated entity dump are contact-handle events, not the autnum registration)

Org status

private subsidiary within the NTT Group (Nippon Telegraph and Telephone Corporation); NTT America operates the GIN in North America [Confirmed for NTT subsidiary structure] — gin.ntt.net, SEC filings

Contacts

abuse@ntt.net; ce-support@gin.ntt.net (NOC); peering@ntt.net (routing/IPR ipr@gin.ntt.net); +1-877-688-6625 [Confirmed] — ARIN RDAP entity vCards

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-21 — not in Spamhaus (access-gated), AbuseIPDB (404), CleanTalk, NANOG archives, or any threat-intelligence feed; only anomaly is a stale HE bogon annotation for prefixes no longer announced

Network & routing

Network type

NTT Group Global IP Network (GIN) / Tier-1 transit ISP; AS280 is a legacy/inactive ASN, the active network runs under AS2914 [Confirmed] — bgp.he.net/AS280, gin.ntt.net

Size

dormant — 0 IPv4 prefixes / 0 IPv4 addresses and 0 IPv6 prefixes announced; historically originated 7 /24s (45.112.144.0/24–45.112.150.0/24) [Confirmed] — RIPEstat routing-status, bgp.he.net (2026-06)

Routing/peering

NOT announced — announced: false per RIPEstat as-overview; 0 RIS peers seeing it (0/327 v4, 0/324 v6); 0 observed neighbours; dark since 2023-12-31 [Confirmed]. NTT's GIN-wide Selective peering policy (published under AS2914) accepts /24-and-shorter v4 and /48-and-shorter v6, RPKI-aware filtering, max-prefix ~110% capped at 5,000

[Confirmed for the GIN/AS2914 policy] — gin.ntt.net/support-center/policies-procedures/routing/

RPKI

not assessable — AS280 announces no prefixes, so there are no ROAs to validate; bgp.he.net shows 0 RPKI-valid and 0 RPKI-invalid origins [Confirmed]

Notable usage

legacy ASN from NTT America's early allocation pool; last appeared in global routing on 2023-12-31; NTT's primary active ASN is AS2914 (the GIN backbone). Historic HE bogon annotation for 7 inactive /24s, now unannounced [Confirmed for routing facts; Likely for the bogon annotation] — bgp.he.net/AS280, ARIN RDAP

Related ASNs

AS2914 (NTT America's active GIN Tier-1 backbone; PeeringDB net/1045) [Confirmed]

Analyst note

Encountered as a dormant/legacy ASN registered to a Tier-1 operator; WHOIS resolves to NTT America, but live routing is under AS2914, not AS280. Clean, inactive ASN. CAIDA AS Rank was unavailable (HTTP 502) at query time, so as_rank / customer_cone are Unknown.