Autonomous system
AS13611 CDC
Unclassified ARIN
Summary
U.S. Centers for Disease Control and Prevention
government research infrastructure
A public health agency announcing a whole /16 and a /19 through exactly one upstream.
What it's used for
- A federal public health agency's network. 73,728 addresses across two IPv4 prefixes,
158.111.0.0/16and198.246.96.0/19, one observed BGP neighbour, and no IPv6 announced.
Notable
- The /19 is netname
CDC3, the agency's initials with a counter. - The /16's registry lookup failed, so nothing is known about its registration here.
- The AS handle is the bare initials, with nothing appended.
- Six addresses were queried for reverse DNS and none returned a name.
Interesting
- Announcing a /16 whole, with no subdivision at all, is the opposite of what most organisations this size do. Two routes for 73,728 addresses is the smallest possible footprint in everyone else's routing table, and it means nothing inside is being steered separately.
- One upstream for an agency whose data the country depends on looks fragile until you remember how federal networks are built. The redundancy lives inside the government's own transit arrangements, below the level a public routing table can see.
- A counter reaching three means two earlier objects exist under the same initials, so the agency's address space was registered in at least three separate rounds.
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 |
|---|---|---|
| AS19050 | U.S. Department of Health & Human Services | 124 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-21, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 2 prefixes · 73.73K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 2 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS13611- Registry name
- CDC
- Registrant
- U.S. Center For Disease Control and Prevention
- Abuse contact
- hostmaster@cdc.gov
- Registered
- 1999-07-14
- Last changed
- 2012-03-07
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 2 with no ROA
- ROAs
- 0 authorising AS13611
- ASPA
- no ASPA record
- IRR
- 100% registered · 2 of 2 announcements
- Route objects
- 2 naming AS13611
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 1,779 prefixes, as published 2026-10-22. 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