Autonomous system
AS4155 USDA-1
Unclassified ARIN
Summary
United States Department of Agriculture (USDA)
government research legacy
USDA-1 belongs to the United States Department of Agriculture, the federal executive department responsible for food, agriculture, rural development, and forestry policy.
What it's used for
- Enterprise networking for USDA and its agencies, which include the Forest Service, the Agricultural Research Service, the Farm Service Agency, and the Natural Resources Conservation Service.
- Connectivity for a highly distributed footprint: USDA runs field and service offices in essentially every US county, plus research stations and labs.
Notable
- This is government address space, not consumer space. Traffic from it generally represents federal staff, field offices, and agency systems rather than residential users.
- USDA holds a very large legacy IPv4 allocation for a civilian agency, including the
199.128.0.0/11block, which alone is over two million addresses. The total announced footprint runs to several million addresses.
Interesting
- The size of the allocation is a fingerprint of early-internet federal networking, when agencies could request address space far in excess of what a modern organization of the same size would ever receive.
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 2026-10-25, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 33 prefixes · 3.15M addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 34 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS4151- Registry name
- USDA-1
- Registrant
- USDA
- Abuse contact
- duty.officer@usda.gov
- Registered
- 1994-12-15
- Last changed
- 2001-01-03
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 25 with no ROA
- ROAs
- 0 authorising AS4155
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 25 announcements 1 other origin
- Route objects
- 0 naming AS4155
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: 443 networks and 1,779 prefixes, as published 2026-10-24. 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