AS603

AS603 (EQUINIX-EC) is a small, low-utilization autonomous system registered under ARIN to Equinix, Inc., the global data-center and digital-infrastructure operator headquartered in Redwood City, California. ARIN's RDAP registry records a first-party registration date of 1999-03-03 for the autnum — independently corroborated by bgp.tools's page text stating the AS was established on that date — with the record last updated 2023-06-13 and status active. Unlike Equinix's flagship interconnection ASNs (AS15830, AS24115), which carry active PeeringDB network records, AS603 has none: it is absent from every ASN listed under Equinix's PeeringDB organization. Live BGP data shows AS603 today originates only a single IPv4 /24 (50.100.5.0/24) and one IPv6 /36 (2001:4818:6000::/36), reaching near-universal route-server visibility (323/325 RIS peers for IPv4) despite that minimal footprint, via a single apparent upstream, Bell Canada (AS855). CAIDA geolocates the AS to Halifax, Nova Scotia, conflicting with the US registrant address on file, and one legacy BGP looking-glass (bgp.he.net) still shows a stale historical name tying the number to Bell-era Canadian hosting infrastructure predating Equinix's 2020 acquisition of Bell's Canadian data centers. No notable public abuse signal was found; a routing-registry hygiene note (an IRR origin mismatch on the announced IPv6 prefix) was observed but is not a confirmed abuse listing.

Operator

Equinix, Inc. (global data-center/digital-infrastructure operator; ARIN handle EQUINIX-EC; HQ Redwood City, CA) [Confirmed] — https://rdap.arin.net/registry/autnum/603, https://www.equinix.com/about

Country / RIR

US, ARIN (registrant address of record); BGP-observed geolocation differs — see Geo footprint below [Confirmed for RIR/registrant] — https://rdap.arin.net/registry/autnum/603

Allocated

1999-03-03 — ARIN RDAP autnum top-level "registration" event, a first-party RIR fact, corroborated by bgp.tools's stated establishment date; last changed 2023-06-13 [Confirmed] — https://rdap.arin.net/registry/autnum/603, https://bgp.tools/as/603

Org status

active (ARIN RDAP status: active) [Confirmed] — https://rdap.arin.net/registry/autnum/603

Website

https://www.equinix.com — operator's general corporate site; no page dedicated to AS603 specifically was found [Confirmed] — https://www.equinix.com/about

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-16 — a partial Spamhaus ASN-DROP check found no listing, CleanTalk shows a 0% spam rate, and no NANOG archive mentions were found; a routing-hygiene note (bogon-prefix announcement history plus an IRR origin mismatch on the announced IPv6 prefix) appears on bgp.he.net but is not a confirmed threat-feed listing; an abuse.ch URLhaus check was inconclusive (CAPTCHA-blocked) [Likely] — https://www.spamhaus.org/blocklists/do-not-route-or-peer/, https://cleantalk.org/blacklists/as603, https://bgp.he.net/AS603

Network & routing

Network type

no operator-published classification specific to AS603; third-party BGP source (IPinfo) labels it "Hosting," consistent with Equinix's general business [Likely] — https://ipinfo.io/AS603

Size / routing footprint

1 IPv4 prefix (50.100.5.0/24, 256 addresses), 1 IPv6 prefix (2001:4818:6000::/36); CAIDA customer cone = itself only (1 ASN, 1 prefix, 256 addresses) — a stub/leaf AS with 0 customers; CAIDA ASRank #67700

[Confirmed] — https://stat.ripe.net/data/announced-prefixes/data.json?resource=603, https://api.asrank.caida.org/v2/restful/asns/603

Routing/peering

no PeeringDB network record for AS603 (confirmed absent from all 10 ASNs listed under Equinix's PeeringDB org); a single apparent upstream/peer, Bell Canada (AS855), per bgp.tools/bgp.he.net BGP tables — CAIDA independently confirms only the degree count (exactly 1 provider relationship) without naming it, and bgp.he.net's IRR-derived list instead names AS577/AS6539/AS11854/AS8104 (likely stale IRR route-object data) [Likely; named upstream unconfirmed by RDAP, sources conflict] — https://www.peeringdb.com/api/net?asn=603, https://bgp.tools/as/603, https://bgp.he.net/AS603

RPKI

Unknown — per-prefix ROA validation was not queried this pass; no posture is inferred [Unknown] — https://stat.ripe.net/data/rpki-validation/data.json

Geo footprint

conflicting signals — CAIDA ASRank geolocates the AS to roughly Halifax, Nova Scotia, Canada, while RIPEstat/RDAP registrant records show a US country code and the Redwood City, CA HQ address [Likely, flagged as a discrepancy rather than resolved] — https://api.asrank.caida.org/v2/restful/asns/603, https://stat.ripe.net/data/as-overview/data.json?resource=603

Notable usage

not documented on any Equinix operator page; live BGP shows a legacy, low-utilization footprint (single /24 + /36) reaching near-universal RIS visibility (323/325 v4 peers) despite the minimal announcement, via upstream Bell Canada (AS855). One looking-glass (bgp.he.net) still carries a stale historical name, "Bell National Hosting Service (BELL-NHS)," for the ASN, and a separate community-research pass links this to Bell Canada's original operatorship prior to Equinix's October 2020 acquisition of 13 Bell data centers in Canada — a plausible but not RDAP-confirmed lineage [Likely] — https://ipinfo.io/AS603, https://bgp.he.net/AS603, https://stat.ripe.net/data/routing-status/data.json?resource=603, https://www.prnewswire.com/news-releases/equinix-completes-us780-million-acquisition-of-13-bell-data-centers-in-canada-301143564.html

Related ASNs

Equinix's actively-peered ASNs per its PeeringDB org record include AS15830 and AS24115 (both hold active PeeringDB network records, unlike AS603); a historical link to AS577 (Bell Canada) is suggested by the stale bgp.he.net name but is not confirmed via RDAP

[Likely] — https://www.peeringdb.com/api/org/2, https://bgp.he.net/AS577

Analyst note

AS603 reads as a legacy, low-utilization ASN in Equinix's portfolio — carrying no PeeringDB presence and only a single /24 and /36 today despite near-universal route visibility — consistent with a small ASN inherited from an acquisition (possibly Bell Canada's data-center business) rather than an actively-marketed peering network.