Summary

  • ARIN holds two separate organisations behind one name: Crusoe Communications, Inc. of Fairfield, New Jersey, whose AS10597 was registered on 30 September 1997 under handle CRUSOE-1, and Crusoe Energy Systems LLC of Denver, whose AS26356 was registered on 14 July 2023 under handle CES-457.
  • The older record has not been maintained since 2012 and its technical contact has not answered ARIN's validation since 30 October 2015, while the newer organisation holds six registered blocks and three ASNs; the handle, the legal name and the maintenance dates separate them, and the word Crusoe does not.

A buying decision made on a name match is a decision made on nothing. That is not a rhetorical flourish. It is what the American Registry for Internet Numbers publishes when you ask it about Crusoe.

Ask for AS10597 and ARIN returns a name, CRUSOE-AS, tied to the organisation handle CRUSOE-1 — Crusoe Communications, Inc. at 387 Passaic Avenue, Fairfield, New Jersey (ASN record). Both the registration date and the last-updated date on that ASN read 30 September 1997. The organisation record behind it shows the same registration date, an address in Fairfield, and a last update of 10 October 2012 (organisation record CRUSOE-1).

That is a filing that has sat largely untouched for fourteen years. ARIN is blunter still about the human layer. The point of contact attached to the ASN, handle MD651-ARIN, carries the Fairfield address and a crusoe.net mailbox, was registered on 27 October 1995 — nearly two years before the ASN it serves — and last updated on 30 October 2014. On that record ARIN states that it has attempted to validate the contact and has received no response since 30 October 2015 (point-of-contact record).

Now ask for AS26356 instead. ARIN returns CRUSOE, tied to CRUSOE ENERGY SYSTEMS LLC, handle CES-457, at 255 Fillmore Street in Denver (ASN record). Registration date 14 July 2023. The organisation record behind it was created on 16 March 2021 and was last updated on 7 April 2026 (CES-457).

Same word at the front. Different organisation handle, different legal name, different state, different decade, different maintenance history. ARIN's related-ASN listing for CES-457 names AS26356, AS399507 (CRUSOE-ASN-A) and AS401405 (CRUSOE-ASN-02); AS10597 is not on that list (related ASNs). The Denver organisation also carries named roles that have been touched this year: a routing and technical contact last updated on 7 October 2026 (routing contact), an administrative contact last updated on 30 October 2026 (administrative contact), and a separate abuse handle (contact roles).

The address space follows the same split. Six blocks are recorded against CES-457: 204.52.16.0/20 as a direct allocation on 13 September 2022 (204.52.16.0/20); 216.147.112.0/21 on 24 May 2024 (216.147.112.0/21); 216.147.166.0/24 as a reassignment on 20 April 2021 (216.147.166.0/24); 216.86.160.0/20 on 5 January 2024 (216.86.160.0/20); an IPv6 direct allocation, 2607:A040::/32, on 14 March 2024 (2607:A040::/32); and 91.106.220.0/22 on 28 June 2021 (91.106.220.0/22).

The publicly maintained network profile tells the same story from the operating side. PeeringDB lists AS26356 as CRUSOE ENERGY SYSTEMS LLC with crusoe.ai as its website, an IRR as-set of AS-CRUSOE-ENERGY, an open peering policy, a global traffic scope, a heavy-inbound ratio, and displayed figures of 100 IPv4 and 100 IPv6 prefixes, with the network record last updated on 1 July 2025 (PeeringDB profile). Those hundred-and-hundred figures are profile fields, not measurements of originated routes — a distinction worth keeping, because the registered blocks and the announced ones are different things.

Where the paperwork gets interesting is the brand's own legal centre. The website privacy notice effective 23 October 2025 names Crusoe Energy Systems LLC, Delaware file number 7027808, at 255 Fillmore Street, Suite 400, Denver (Crusoe legal centre). The cloud platform terms effective 5 November 2026 name a different contracting party altogether: Crusoe Technologies LLC and its affiliates. Two notices, two legal names, one brand. Neither of them is Crusoe Communications, Inc. of Fairfield, New Jersey.

That is the whole mechanism, and it is worth stating plainly: the registry is an address book, not a family tree. It records which numbers are in use and which organisation is answerable for them. It does not own the houses, it does not arbitrate who deserves a name, and it does not — and should not — pronounce on whether two similarly named companies are related. The name string on an ASN is a convenience label. The organisation handle and the registered legal name are the identity. Anyone who resolves on the label is resolving on the least reliable field in the record.

So the older entry is not a scandal and the newer one is not a rebrand. They are two filings in a public book, one maintained and one not. The obligation to keep a record current belongs to the holder, not to the reader and not to the registry. The administrator's job is narrower than it is often asked to be: keep the book complete, keep identifiers unique, prompt the holders whose contacts have gone quiet. ARIN did exactly that when it logged that its validation attempts on the Fairfield contact had gone unanswered since 2015.

Beyond prompting, adjudicating a name collision would be a different function entirely, and not one a registry should want.

For a reader, the practical test takes a minute and costs nothing. Ask for the ASN. Read the organisation handle, not the name. Read the legal name on the organisation record. Read the dates on the ASN, the organisation and the point of contact. If the contact's last validation predates the cloud era, you are not looking at the company you think you are looking at. Crusoe Communications, Inc. keeps its own entry in our directory for exactly this reason (directory entry).

One thing this reading could not settle: whether AS10597 still originates any traffic, and who administers the CRUSOE-1 record today. ARIN's related-networks listing for that handle returned an access error, so any further blocks held by the older organisation were not established here. A stale record is evidence of missing maintenance. It is not evidence of dormancy, dissolution, or a hidden connection to Denver.

What the dates do establish is enough for the decision in front of a buyer. When the name on the screen and the handle in the record disagree, the handle wins. Every time.