AS5511

AS5511 is the autonomous system behind Opentransit, the brand name for Orange S.A.'s worldwide IP backbone and wholesale IP transit business (formerly France Telecom Réseaux et Services Internationaux). Registered under RIPE NCC to Orange S.A. in France, it is a Tier 1, transit-free carrier that sells global IP transit and content distribution to ISPs and content providers rather than serving residential subscribers. The network is large and exceptionally well connected: RIPEstat reports it announces 589 IPv4 prefixes and 14 IPv6 prefixes (603 total), all of which are seen by 100% of RIPE RIS collector peers — a visibility profile characteristic of a top-tier backbone. Its first BGP origination (193.251.160.0/20) was observed in August 2000, predating the formal RDAP registration timestamp. Routing topology shows dozens of upstream relationships and several hundred downstream customers, with CAIDA placing it among the highest AS-cone ranks globally (cited as #11 worldwide, #1 in France, though the CAIDA fetch timed out during this run so the exact rank is recorded as Unknown). Security posture is strong: Orange completed RPKI Origin Validation (ROV) filtering network-wide in 2022, all sampled prefixes validate as ROA-valid, and a published abuse contact is on file. No ASN-level blocklist listing or named hijack/route-leak origination was found as of June 2026; the sole routing controversy on record is the well-known 2005 commercial depeering dispute with Cogent (AS174), a peering-policy matter rather than a security incident.

Operator

Orange S.A. (brand: Opentransit; formerly France Telecom Réseaux et Services Internationaux) [Confirmed] — RIPE RDAP autnum/5511 (org ORG-FT2-RIPE "Orange S.A."), peeringdb.com/net/495

Country / RIR

France, RIPE NCC [Confirmed] — RIPE RDAP autnum/5511, ipinfo.io/AS5511

Allocated

2002-09-17 (RIPE RDAP autnum top-level registration event — a first-party RIR registry fact, NOT an IEEE date); last registry update 2026-06-22 [Confirmed] — rdap.db.ripe.net/autnum/5511. Note: first BGP prefix observed 2000-08-18, which is historical routing observation, not the registry allocation date.

Org status

active; RIPE NCC registered; status active/ok; HQ 44 Avenue de la République, 92326 Chatillon Cedex, France [Confirmed] — RIPE RDAP autnum/5511, peeringdb.com/net/495

Contacts

abuse gestionip.ft@orange.com (RIPE abuse-c BRX1-RIPE; also abuse@opentransit.net cited in third-party WHOIS); peering orange.peering@orange.com [Confirmed for RDAP abuse address; Likely for opentransit.net alias] — RIPE RDAP autnum/5511

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-25 — no ASN-level Spamhaus/CleanTalk/threat-feed listing identified, no named role as originator of a BGP hijack or route leak (AS5511 appeared only as a transit hop in the 2017 Google/Verizon leak); the 2005 Cogent depeering is a commercial/peering matter, not abuse

Network & routing

Network type

Tier 1 NSP / global IP transit carrier; transit-free (no upstream providers in the commercial sense); wholesale IP transit and content distribution [Confirmed] — peeringdb.com/net/495, bgp.he.net/AS5511, bgp.tools/as/5511

Size

589 IPv4 prefixes (~439,808 IPv4 addresses) + 14 IPv6 prefixes (~262,276 /48 equivalents); 100% RIS visibility v4 (326/326) and v6 (323/323) [Confirmed] — RIPEstat routing-status (resource=AS5511)

Routing/peering

383 observed neighbours total; ~68 upstreams and ~376 downstreams per RIPEstat asn-neighbours; notable upstreams/peers include AS1299 (Arelion), AS3356 (Lumen), AS2914 (NTT), AS174 (Cogent), AS6762 (TI Sparkle), AS6453 (TATA), AS3215 (Orange France), AS6939 (Hurricane Electric), AS701 (Verizon) [Confirmed] — RIPEstat asn-neighbours (resource=AS5511&lod=1). Restrictive published peering policy; IRR macro AS-OPENTRANSIT; peering contact orange.peering@orange.com [Confirmed for AS-set via PeeringDB; Likely for policy text — operator peering-policy page returned a TLS error, cross-confirmed via PeeringDB]

RPKI

strong — all sampled prefixes (193.251.160.0/20, 80.12.160.0/19, 193.253.158.0/23, 2001:688::/32) validate as ROA-valid via Routinator; Orange completed network-wide ROV filtering deployment by 2022-06-27 [Confirmed] — RIPEstat rpki-validation, wholesale.orange.com RPKI deployment docs

AS rank / customer cone

Unknown — CAIDA AS Rank / customer-cone fetch timed out this run; third-party sources cite ~#11 global / #1 France cone rank [Likely] — asrank.caida.org/asns/5511 (not directly verified this run)

Notable usage

Orange's worldwide IP backbone for wholesale IP transit and content distribution; carries subsidiaries including Orange Espagne, Orange Polska, Orange Business Germany; Orange operates an IP-transit DDoS cleaning platform [Confirmed for backbone role] — bgp.he.net/AS5511, peeringdb.com/net/495

Related ASNs

AS3215 (Orange S.A. France domestic network) appears as a routing neighbour and likely sibling under Orange [Likely] — RIPEstat asn-neighbours (resource=AS5511&lod=1)

Analyst note

Encountered as a large, active Tier 1 transit ASN under Orange. Registry allocation date taken from the RIPE RDAP autnum top-level registration event (2002-09-17); the earlier 2000-08-18 BGP first-seen is observation data, not the registry date.