asn.dev

Autonomous system

AS64226 MDURESOURCES - MDU Resources Group, Inc.

Unclassified ARIN

IPv4 addresses 65.02K 16 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

MDU Resources Group

United States of America · AI-generated

business energy corporate internal

The AS handle MDURESOURCES is held by MDU Resources Group, Inc.

What it's used for

  • The address space is registered under the netname MDURES for all 16 announced IPv4 prefixes, indicating a unified corporate estate.
  • The network announces 65,024 IPv4 addresses across 16 prefixes with only 2 observed neighbours, a ratio characteristic of an internal corporate network rather than a transit or access provider.
  • Traffic from this AS consists of internal communications and operations for a U.S.-based corporation supplying products and services to regulated energy delivery and utilities.

Notable

  • All registrants in the RDAP data are consistent with the announcer, listing MDU Resources Group, Inc. for every prefix.
  • The address inventory is concentrated within the 162.57.0.0/17 block, subdivided into smaller prefixes ranging from /19 to /24.
  • MDU Resources Group spun off its construction arm, rebranding it as Everus Construction Group.

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

2 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS26794Dakota Carrier Network793
AS7018AT&T Enterprises, LLC240

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-01, 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 16 prefixes · 65.02K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America16

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS64226
Registry name
MDURESOURCES
Registrant
MDU Resources Group, Inc.
Abuse contact
paul.martin@mdu.com
Registered
2015-10-06
Last changed
2015-11-16
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 17 with no ROA
ROAs
0 authorising AS64226
ASPA
no ASPA record
IRR
0% registered · 0 of 17 announcements 11 other origin
Route objects
0 naming AS64226

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: 449 networks and 1,846 prefixes, as published 2026-11-02. 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