AS223

AS223 is a low-numbered legacy autonomous system registered under ARIN to Parsons Corporation, a US engineering, defense, intelligence, and critical-infrastructure firm founded in 1944 as the Ralph M. Parsons Company. The ASN itself is old — the ARIN RDAP autnum top-level registration event dates it to 1988-08-15, placing AS223 among the earliest assignments in the registry — while the registrant organization record (handle PCIP) was last reorganized in ARIN's database in 2011. AS223 is an enterprise/corporate network: it backs Parsons' own internal IT and corporate connectivity rather than serving as a public ISP, transit, or hosting provider. It is actively announced, carrying a small IPv4 footprint across the 206.219.x.x and 209.128.x.x ranges (RIPEstat shows 8 currently active prefixes / ~2,048 IPs; bgp.he.net observes 13 prefixes / ~3,072 IPs over a wider window) and no IPv6 at all. The network reaches the global table purely as a transit customer — upstreams observed include Level 3 / Lumen (AS3356), Zayo Bandwidth (AS6461), Equinix (AS15830), and LINK BRASIL (AS271253) — with full RIS v4 visibility (327/327 peers) and no downstream customers. There is no PeeringDB record (HTTP 404) and no published peering policy, consistent with a pure transit-customer enterprise. No notable public abuse signal was found as of 2026-06-19: no Spamhaus DROP/ASNDROP/SBL listing, no blacklist hits, and no NANOG or threat-intel mentions. The only routing-hygiene notes are a bgp.he.net "announces bogons" flag and an IRR origin-mismatch warning on a few 209.128.x.x prefixes — registry/configuration concerns, not evidence of abuse. RPKI posture is effectively unmanaged: zero ROAs, so no valid or invalid originations.

Operator

Parsons Corporation (US engineering / defense / intelligence / critical-infrastructure firm; ARIN registrant handle PCIP) [Confirmed] — ARIN RDAP autnum/223, ipinfo.io/AS223, en.wikipedia.org/wiki/Parsons_Corporation

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum/223

Allocated

1988-08-15 (ARIN registry date from the autnum top-level registration event — a first-party RIR fact, NOT an IEEE date); last changed 2015-07-02 [Confirmed] — ARIN RDAP autnum top-level events

Org status

publicly traded company (NYSE: PSN); private/ESOP from 1985 until its May 2019 IPO; ~18,000–21,000 employees across 30+ countries; historical Pasadena, CA roots (ARIN contact still lists 100 W. Walnut Street, Pasadena, CA 91124), corporate HQ now Chantilly, VA [Confirmed for public/IPO/employees/address; HQ-location Likely] — en.wikipedia.org/wiki/Parsons_Corporation, ARIN RDAP autnum/223

Contacts

Hostmaster@parsons.com; +1-800-252-8108 (registrant address 100 W. Walnut Street, Pasadena, CA 91124, US) [Confirmed] — ARIN RDAP autnum/223

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-19 — no Spamhaus DROP/ASNDROP/SBL listing, no community-blacklist hits, no NANOG/Reddit threads, no threat-intel reports; only routing-hygiene items: bgp.he.net "announces bogons" flag and IRR "Parent Route Origin Mismatch" on a few 209.128.x.x prefixes (configuration/registry concerns, not abuse) [Likely — several abuse-feed endpoints returned 404/403, so finding rests partly on absence of signal] — bgp.he.net/AS223, whois.ipip.net/AS223, spamhaus.org/blocklists/do-not-route-or-peer/

Network & routing

Network type

enterprise / corporate (internal business network; not a public ISP, transit, or hosting provider) [Confirmed] — ipinfo.io/AS223, whois.ipip.net/AS223

Size

small — RIPEstat shows 8 active IPv4 prefixes / ~2,048 IPs; bgp.he.net observes 13 prefixes / ~3,072 IPs over a wider window; 0 IPv6 prefixes (range reported because the two sources differ by observation window) [Confirmed] — stat.ripe.net routing-status, bgp.he.net/AS223

Routing/peering

announced; full RIS v4 visibility (327/327 peers), 0/324 v6; 3 observed neighbours per RIPEstat, 4 BGP peers per bgp.he.net; upstreams AS3356 (Level 3/Lumen), AS6461 (Zayo), AS15830 (Equinix), AS271253 (LINK BRASIL); no downstream customers; no PeeringDB record (404) and no published peering policy [Confirmed for routing data; peering policy Unknown] — stat.ripe.net routing-status, bgp.he.net/AS223, peeringdb.com/asn/223

RPKI

no ROAs — 0 RPKI-valid and 0 RPKI-invalid originations; per-prefix RPKI validation not assessable without a supplied prefix per RIPEstat [Confirmed] — bgp.he.net/AS223, stat.ripe.net rpki-validation

Notable usage

AS223 backs Parsons Corporation's own corporate internet connectivity (internal enterprise operations, not external customers) across 206.219.x.x and 209.128.x.x IPv4 ranges; reaches the table purely via transit; routing first seen 2021-03-03, last seen 2026-06-19

[Confirmed] — whois.ipip.net/AS223, ipinfo.io/AS223, stat.ripe.net routing-status

Analyst note

Encountered as a low-numbered, long-registered (1988) corporate enterprise ASN held by a major US defense/infrastructure contractor. The top-level autnum registration is 1988-08-15; the nested org record's 2011-06-16 registration is a database reorg date and was NOT mistaken for the ASN allocation. Clean, actively-announced enterprise network with minor routing-hygiene flags.