AS16

AS16 is a legacy single-digit allocation registered under ARIN to Lawrence Berkeley National Laboratory, a U.S. Department of Energy national lab — a distinct entity from UC Berkeley (AS25), which analysts should not conflate. It actively announces 128.3.0.0/16 and 131.243.0.0/16 plus IPv6 2620:83:8000::/48 (about two IPv4 prefixes and one IPv6), taking transit from ESnet (AS293, DOE's Energy Sciences Network) and CENIC/CalREN (AS2152), with CENIC AS2153 also among its peers; AS16 is a member of the ESnet (AS293) AS-SET, reflecting that upstream relationship. The bgp.tools ARIN mirror shows a RegDate of 1970-01-01, which is a Unix-epoch placeholder rather than a real assignment date, so the allocation date is recorded as unknown. For triage this is a DOE national-lab network behind ESnet and CENIC carrying benign research traffic — a different organization and ASN from UC Berkeley. No notable public abuse signal was found as of June 2026.

Operator

Lawrence Berkeley National Laboratory (ARIN OrgId LBNL-Z, Berkeley, CA) [Confirmed] — ARIN RDAP

Country / RIR

US, ARIN [Confirmed]

Allocated

bgp.tools ARIN mirror shows 1970-01-01 = Unix-epoch placeholder, NOT a real date; org updated 2024-06-06; original assignment Unknown

Org status

active — lbl.gov

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-07; benign research traffic — bgp.tools

Network & routing

Network type

research / education — U.S. DOE national laboratory [Confirmed]

Size

2 IPv4 prefixes, 1 IPv6; announces 128.3.0.0/16, 131.243.0.0/16, 2620:83:8000::/48 — bgp.tools (2026-06)

Routing/peering

upstreams AS293 (ESnet), AS2152 (CENIC/CalREN); peers incl. AS2153 (CENIC); member of ARIN as293:as-esnet AS-SET; RPKI partial / IRR-matched — bgp.tools

Notable usage

U.S. DOE national lab (distinct from UC Berkeley/AS25); announces 128.3.0.0/16 and 131.243.0.0/16 — lbl.gov

Related ASNs

AS63331 (also Lawrence Berkeley National Laboratory); ESnet AS293 (upstream) [Confirmed]

Analyst note

A DOE national-lab network behind ESnet and CENIC; benign research traffic. Do NOT conflate with UC Berkeley (AS25) — different organization, different ASN.