AS685

AS685 is a dormant legacy ASN registered to NTT America, Inc. that has not announced any prefixes in the global routing table since October 2020, making it operationally retired despite an "active" registry status.

ARIN's RDAP registry shows AS685 (handle NTTA-685) was registered on 2001-01-31, with the top-level record most recently updated in 2024. The registrant traces to NTT America's Redmond, WA office, while several associated ARIN contact entities (abuse, NOC, peering) list a Greenwood Village, CO address shared across the wider NTT contact pool.

Routing sources agree unanimously: RIPEstat, CAIDA ASRank, bgp.he.net, and bgp.tools all show zero announced IPv4/IPv6 prefixes, zero upstreams, and a customer cone limited to the ASN itself (CAIDA rank 79,459). The one historical announcement on record, 165.254.28.0/24, appeared briefly from 2020-10-20 to 2020-11-04 and is flagged by bgp.he.net as a bogon route — address space not validly assigned to this ASN.

NTT America, Inc. was folded into the unified "NTT" brand effective 2019-10-01, as Dimension Data Americas, NTT America, and NTT Security consolidated under NTT Ltd. NTT's live, operator-documented Tier-1 backbone today runs under AS2914 (NTT DATA Global IP Network); AS685 appears to be a legacy numbering resource left registered rather than an actively managed network.

Operator

NTT America, Inc. (ARIN handle NTTA-685); corporate successor operates as NTT DATA Global IP Network under AS2914 [Confirmed] — https://rdap.arin.net/registry/autnum/685, https://www.gin.ntt.net/dimension-data-americas-ntt-america-and-ntt-security-become-ntt/

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/685

Allocated

2001-01-31 (ARIN RDAP autnum top-level registration event, confirmed via direct canonical RDAP re-fetch, not a nested contact-entity date) [Confirmed] — https://rdap.arin.net/registry/autnum/685

Org status

ARIN registry status "active" but operationally dormant; NTT America, Inc. rebranded to NTT effective 2019-10-01 under the NTT Ltd. consolidation, coinciding with AS685 going dark ~14 months later [Confirmed] — https://rdap.arin.net/registry/autnum/685, https://www.gin.ntt.net/dimension-data-americas-ntt-america-and-ntt-security-become-ntt/

Contacts

abuse@ntt.net (NAAC-ARIN); ce-support@gin.ntt.net (NASC-ARIN); ipr@gin.ntt.net (VIPAR-ARIN); peering@ntt.net (PEERI-ARIN) [Confirmed] — https://rdap.arin.net/registry/autnum/685

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-18; historical bogon route is a routing-hygiene artifact, not documented abuse

Network & routing

Network type

legacy/retired NTT America transit ASN; not visible in the global routing table since 2020-10-21 [Confirmed] — https://bgp.he.net/AS685

Size

dormant — 0 IPv4/IPv6 prefixes announced; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses [Confirmed] — https://stat.ripe.net/AS685, https://asrank.caida.org/asns/685

Routing/peering

no active upstreams or peers; bgp.he.net lists one historical peer, AS2914, not corroborated by CAIDA (asnDegree.peer: 0) [Likely] — https://bgp.he.net/AS685, https://asrank.caida.org/asns/685

RPKI

not assessable — no announced prefixes, no ROAs to validate [Confirmed] — https://bgp.he.net/AS685

Notable usage

originated exactly one prefix, 165.254.28.0/24 (bogon-flagged), from 2020-10-20 to 2020-11-04 [Confirmed] — https://stat.ripe.net/AS685, https://bgp.he.net/AS685

Related ASNs

AS2914 (NTT DATA Global IP Network, active Tier-1 backbone; corporate sibling/parent under the same organization) [Confirmed] — https://bgp.he.net/AS685, https://www.gin.ntt.net/support-center/policies-procedures/routing/

ASN

AS685 [Confirmed] — https://rdap.arin.net/registry/autnum/685

Analyst note

dormant legacy ASN; live routing appears consolidated into AS2914 shortly after NTT's 2019 rebrand. No AS685-specific peering policy page or PeeringDB net entry exists.