Autonomous system
AS11875 WILLIAM-HERRIN
Unclassified ARIN
Summary
William Herrin (Dirtside Systems)
enterprise legacy
WILLIAM-HERRIN is exactly what the handle says: an autonomous system held by a single person, registered to William Herrin as a sole proprietorship in Seattle, Washington. It is one of the internet's genuinely small ASes, run by a career network engineer for his own consultancy and personal infrastructure.
What it's used for
Self-hosting and consultancy infrastructure. RIS sees two IPv4 prefixes (199.33.224.0/23 plus a more-specific /24, 512 addresses in total) and one IPv6 /44, with two observed neighbours. Two neighbours is the signature of an end site that multi-homes for resilience rather than a network that sells transit. The sampled reverse DNS resolves under dirtside.com, the domain of Herrin's Seattle consultancy Dirtside Systems, so the space carries his own hosts rather than customers'.
Notable
- The prefixes are registered in ARIN to Why InterNetworking, not to the AS holder's name. That mismatch looks like the classic leased-space tell until you check: Why? InterNetworking was Herrin's own 1990s web-services business. Same operator, different era, and the rDNS under his current company confirms it. This is history, not brokerage.
- ARIN dates the AS number to 2008, another reminder that a low five-digit number in this range says nothing about a network's age.
Interesting
Herrin is a long-standing voice in the operator community, active on NANOG and in routing-research circles, which is very much the profile of someone who keeps a personal ASN and IPv6 allocation running for its own sake.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 1 prefixes · 512 addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 2 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11875- Registry name
- WILLIAM-HERRIN
- Registrant
- William Herrin, Sole Proprietorship
- Abuse contact
- arin-contact@herrin.us
- Registered
- 2008-12-05
- Last changed
- 2012-03-02
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 33% valid · 1 valid, 2 with no ROA
- ROAs
- 1 authorising AS11875
- ASPA
- no ASPA record
- IRR
- 100% registered · 3 of 3 announcements
- Route objects
- 2 naming AS11875
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,771 prefixes, as published 2026-10-15. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere