Autonomous system
AS4138 FN-205-4138
Unclassified ARIN
Summary
FAL Networks
enterprise legacy
FN-205-4138 is FAL Networks, a small independent network operator registered in Tryon, North Carolina.
What it's used for
- A minimal routed presence: a single IPv4
/24alongside a comparatively large IPv6 footprint, taking transit from a few upstream providers. - Public information about the network is thin, and the registry does not describe a service offering, so its purpose is best left undescribed rather than guessed at.
Notable
- The IPv4-to-IPv6 balance is inverted relative to most networks of this size: one IPv4 prefix against many IPv6 blocks, which is a pattern seen in IPv6-forward and experimental deployments.
- Despite the low number, this is a modern holder. ARIN registered both the organisation and the autnum in 2017, so AS4138 was reissued and carries no early-internet pedigree.
Interesting
- Very low ASNs occasionally resurface with new, small owners after being returned to the RIR pool, which is why the number alone is a poor guide to a network's age or importance.
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 2 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS1097 | Core Transit LLC | 411 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-28, 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 21 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 22 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS4138- Registry name
- FN-205-4138
- Registrant
- FAL Networks
- Abuse contact
- TECH@Fal-networks.com
- Registered
- 2017-07-07
- Last changed
- 2023-08-26
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 100% valid · 12 valid, 0 with no ROA
- ROAs
- 2 authorising AS4138
- ASPA
- 3 declared providers
- IRR
- 100% registered · 12 of 12 announcements
- Route objects
- 15 naming AS4138
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: 448 networks and 1,851 prefixes, as published 2026-10-29. 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