asn.dev

Autonomous system

AS21553 ASP-MAIN - Aspirus, Inc.

Unclassified ARIN

IPv4 addresses 512 2 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

Aspirus Health Care

United States of America · AI-generated

healthcare business enterprise

ASP-MAIN is the autonomous system for Aspirus, Inc., a healthcare provider operating hospitals and clinics in the United States.

What it's used for

  • The address space carries internal corporate traffic, evidenced by the netname ASPIR-13 assigned to both announced prefixes.
  • The AS announces 512 IPv4 addresses across 2 prefixes with 2 observed neighbours, a ratio consistent with a small, self-contained enterprise network rather than a transit or access provider.

Notable

  • The registrant for both prefixes, Aspirus, Inc., matches the AS holder, confirming direct ownership of the address space.
  • The inventory consists of two /24 blocks, 204.10.109.0/24 and 216.99.223.0/24, representing a modest footprint typical of a regional healthcare system's internal infrastructure.

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
AS10352Solarus66
AS40264Charter Communications LLC63

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-31, 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 2 prefixes · 512 addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America2

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS21553
Registry name
ASP-MAIN
Registrant
Aspirus, Inc.
Abuse contact
aspirus.networking@aspirus.org
Registered
2017-09-19
Last changed
2017-09-19
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 2 with no ROA
ROAs
0 authorising AS21553
ASPA
no ASPA record
IRR
100% registered · 2 of 2 announcements
Route objects
2 naming AS21553

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: 447 networks and 1,843 prefixes, as published 2026-11-01. 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