AS263

AS263 is a legacy autonomous system number registered under ARIN to NTT America, Inc., the U.S. operating arm of the NTT group (NTT America is a subsidiary of NTT Communications, itself part of Nippon Telegraph and Telephone Corporation). The key triage point for AS263 is that it is effectively dormant: every routing source consulted (RIPEstat, bgp.he.net, bgp.tools, BGPView) agrees it announces zero IPv4 and zero IPv6 prefixes, has zero visible BGP peers, and no upstreams or customers in the current global routing table. RIPEstat routing-status confirms it is seen by 0 of 327 RIS peers for IPv4 and 0 of 322 for IPv6. NTT's active, globally significant routing runs under AS2914 (the NTT Global IP Network / GIN), a Tier-1 backbone that carries hundreds of thousands of prefixes across the Americas, Europe, Asia, and Oceania; AS263 is a separate, inactive identifier within NTT America's portfolio and should not be confused with it. The ASN's ARIN record was last changed in 2012, consistent with long-standing dormancy. RPKI posture cannot be assessed for AS263 because there are no active originations and therefore no ROAs. No notable public abuse signal was found as of June 2026 — not in Spamhaus ASN-DROP, CleanTalk, AbuseIPDB, BGPView, or NANOG archives — consistent with a clean, dormant ASN held by a respected Tier-1 carrier. A name string seen at bgp.he.net ("NTTC-CNPP" / "Cloud Network Protection Project") could not be corroborated against any public NTT documentation and is left unverified; the ARIN-canonical name is NTTA-263.

Operator

NTT America, Inc. (subsidiary of NTT Communications / NTT group; ARIN org handle NTTAM-1) [Confirmed] — ARIN RDAP autnum/263, ipinfo.io/AS263

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum/263, bgp.tools/as/263

Allocated

2000-07-11 (ARIN registry date, NOT an IEEE date — IEEE publishes no ASN registration dates); last changed 2012-12-10 [Confirmed] — ARIN RDAP autnum top-level events

Org status

active subsidiary — NTT America, Inc. (org handle NTTAM-1), part of NTT Communications / NTT group; ARIN registration active [Confirmed] — ARIN RDAP autnum/263, services.global.ntt/en-us/about-us/ntt-ltd-direct-subsidiaries

Contacts

abuse@ntt.net (NAAC-ARIN); ce-support@gin.ntt.net (NASC-ARIN); peering@ntt.net (PEERI-ARIN); registered address 8300 E Maplewood Ave., Suite 400, Greenwood Village, CO 80111, US [Confirmed] — ARIN RDAP autnum/263

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-21 — not in Spamhaus ASN-DROP, CleanTalk, AbuseIPDB, BGPView, or NANOG archives; dormant ASN under a Tier-1 carrier with published AUP/RPKI deployment

Network & routing

Network type

legacy/dormant ASN held by a Tier-1 carrier; NTT's active backbone runs under AS2914 (NTT Global IP Network / GIN) [Confirmed] — ipinfo.io/AS263, gin.ntt.net, bgp.he.net/AS263

Size

dormant — 0 IPv4 prefixes / 0 IPv4 addresses and 0 IPv6 prefixes; no customer cone visible [Confirmed] — RIPEstat routing-status / bgp.he.net / bgp.tools / BGPView (2026-06)

Routing/peering

NOT announced — 0/327 RIS peers seeing v4, 0/322 seeing v6; no upstreams or peers visible in any source [Confirmed]. NTT's active AS2914 runs a Selective peering policy (peering@ntt.net) [Likely for AS2914 policy] — gin.ntt.net/support-center/policies-procedures/routing/, peeringdb.com/net/1045

RPKI

not assessable — AS263 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

AS263 (NTTA-263) is a legacy/dormant NTT America ASN; NTT's active global backbone is AS2914 (GIN). A bgp.he.net name string "NTTC-CNPP / Cloud Network Protection Project" appears but has no public NTT documentation and is left unverified [Likely it is a legacy/alternate DB name string] — bgp.he.net/AS263, ipinfo.io/AS263

Related ASNs

AS2914 (NTT's active Global IP Network / GIN backbone) [Confirmed] — ipinfo.io/AS263, gin.ntt.net

Analyst note

Encountered as a dormant legacy ASN registered to a Tier-1 carrier; WHOIS resolves to NTT America, but live routing runs under AS2914, not AS263. Clean, inactive ASN. CAIDA AS-rank/customer-cone returned HTTP 502 at fetch time and could not be recorded.