AS11941 PWLLP-AS001

PWLLP-AS001 belongs to the international law firm Pillsbury Winthrop Shaw Pittman LLP. ARIN still carries the org under its predecessor name, Pillsbury Madison & Sutro, Inc., but the contacts all sit at pillsburylaw.com, and the listed address is the firm's Nashville operations office.

What it's used for

RIS shows 22 IPv4 prefixes totalling 5,632 addresses, no IPv6, and 12 observed BGP neighbours. Every prefix is a /24 drawn from one contiguous legacy range around 204.227.224.0–204.227.255.0, and every one is registered in ARIN as PMSNET, org Pillsbury Madison & Sutro, Inc. That is a single self-registered block sliced into /24s, not scattered space from unrelated registrants: entirely first-party inventory, with no leasing or brokerage pattern anywhere in it.

The shape fits a large multi-office law firm. Announcing the block as individual /24s rather than one aggregate lets the firm steer or fail over office ranges independently across a dozen upstreams, and a firm with offices across the US, London and Asia has good reason to do that. Twelve neighbours is still enterprise territory, well short of the hundreds a transit carrier would show against this much address space.

Notable

The name is a trap worth flagging. This is not the Pillsbury of flour and the Doughboy. Pillsbury Madison & Sutro was a San Francisco law firm, which merged with Winthrop Stimson Putnam & Roberts and later Shaw Pittman to become today's Pillsbury Winthrop Shaw Pittman, and the registry simply never caught up with the rebrand.