asn.dev

Autonomous system

AS20131 MCFARLANDCLINIC - McFarland Clinic PC

Unclassified ARIN

IPv4 addresses 256 1 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

McFarland Clinic

United States of America · AI-generated

healthcare business clinic iowa

The AS handle MCFARLANDCLINIC is held by McFarland Clinic PC.

What it's used for

  • The address space carries internal corporate infrastructure, evidenced by the reverse DNS record mailsend.mcfarlandclinic.com and the netname MCFARLANDCLINIC.
  • The network announces 256 IPv4 addresses within a single /24 prefix (167.142.235.0/24) and maintains 2 observed neighbours, indicating a small, self-contained site network rather than a transit or access provider.

Notable

  • The RDAP registrant McFarland Clinic PC matches the AS holder, confirming direct ownership of the address space.
  • McFarland Clinic is a multi-specialty medical group with 15 locations in Ames, Iowa, providing over 50 medical specialties.
  • The inventory consists of a single contiguous IPv4 block with no announced IPv6 prefixes, typical of a legacy corporate estate.

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

Full topology · Graph

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.

ASNetworkPaths seen
AS5056Aureon Network Services63

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-06, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 1 prefixes · 256 addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America1

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS20131
Registry name
MCFARLANDCLINIC
Registrant
McFarland Clinic PC
Abuse contact
jandersen@mcfarlandclinic.com
Registered
2018-05-08
Last changed
2018-05-08
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 1 with no ROA
ROAs
0 authorising AS20131
ASPA
no ASPA record
IRR
0% registered · 0 of 1 announcements
Route objects
2 naming AS20131

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: 454 networks and 1,854 prefixes, as published 2026-11-06. 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

Cross-check