Autonomous system
AS4891 PORTO-18-4891
Unclassified ARIN
Summary
Port of Houston Authority
government legacy
PORTO-18-4891 is the Port of Houston Authority of Harris County, Texas, the public agency that operates the port's terminals and the Houston Ship Channel.
What it's used for
- Connectivity for the Authority's own operations: administrative offices, terminal facilities and port systems along the ship channel.
- A single small block, announced for the Authority's own use rather than resold. This is a government end-user network, not a provider.
Notable
- The Port of Houston Authority is a political subdivision of the State of Texas, so this is public-sector address space even though the port operates commercially.
- The low AS number carries no early-internet pedigree. ARIN registered it to the Authority in 2018, from reclaimed space.
Interesting
- Port authorities increasingly run their own AS because terminal operations, gate systems and security infrastructure need carrier-independent, multihomed connectivity across a physically sprawling site.
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.
Transit providers
1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS13767 | DataBank Holdings, Ltd. | 59 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-27, 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 · 256 addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 1 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS4891- Registry name
- PORTO-18-4891
- Registrant
- Port of Houston Authority of Harris County, Texas
- Abuse contact
- rfarrow@poha.com
- Registered
- 2018-02-16
- Last changed
- 2018-02-16
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 1 with no ROA
- ROAs
- 0 authorising AS4891
- ASPA
- no ASPA record
- IRR
- 100% registered · 1 of 1 announcements
- Route objects
- 1 naming AS4891
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: 447 networks and 1,852 prefixes, as published 2026-10-27. 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