asn.dev

Autonomous system

AS18708 HDR-CORP

Unclassified ARIN

IPv4 addresses 3.07K 7 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 3 0 downstream
Flagged prefixes 0 none

Summary

HDR, Inc.

United States of America · AI-generated

business corporate engineering architecture

The AS handle HDR-CORP is held by HDR, Inc., a global professional services firm specializing in architecture, engineering, and environmental design.

What it's used for

  • The address space carries internal corporate traffic, evidenced by netnames such as HDR-CORPORATE and HDR-EMEA-3 associated with registrants like HDR, Inc. and HDR International, Inc.
  • The inventory consists of 7 IPv4 prefixes totaling 3072 addresses, with only 3 observed neighbours, indicating a small, self-contained corporate network rather than a transit or access provider.

Notable

  • Registrants align with the announcer, including HDR, Inc. for the primary 199.168.240.0/22 block and HDR International, Inc. for the 185.168.252.0/23 block.
  • The address inventory is finely subdivided into seven small prefixes, reflecting site-by-site segmentation typical of a large multinational corporation managing distinct regional or functional networks.

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

3 upstream, 0 downstream and 3 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS1828Unitas Global236
AS3356Level 3 Parent, LLC99
AS7018AT&T Enterprises, LLC21

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-26, 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 7 prefixes · 3.07K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America7

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS18708
Registry name
HDR-CORP
Registrant
HDR, Inc.
Abuse contact
scott.gebers@hdrinc.com
Registered
2007-09-25
Last changed
2025-03-12
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 6 with no ROA
ROAs
0 authorising AS18708
ASPA
no ASPA record
IRR
100% registered · 6 of 6 announcements
Route objects
14 naming AS18708

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: 446 networks and 1,852 prefixes, as published 2026-10-27. 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