asn.dev

Autonomous system

AS36221 ESOSOFT

Unclassified ARIN

IPv4 addresses 1.79K 5 prefixes
IPv6 prefixes 8 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

EsoSoft Corporation

United States of America · AI-generated

hosting business us

The AS handle ESOSOFT is held by EsoSoft Corporation.

What it's used for

  • The address space carries hosting infrastructure, evidenced by the reverse DNS pointer 66-241-159-126.ptr.esosoft.net and the netname NETBLK-ESOSOFT-01 associated with all announced IPv4 prefixes.
  • The network announces 1792 IPv4 addresses across 5 prefixes and 8 IPv6 prefixes, while maintaining only 2 observed neighbours, a ratio that indicates a small-scale hosting or business network rather than a transit provider.

Notable

  • All RDAP registrants for the announced prefixes are listed as Esosoft Corporation, which agrees with the AS holder name.
  • The address inventory consists of five contiguous IPv4 blocks within the 66.241.144.0/22 range and eight distinct /48 IPv6 prefixes under the 2607:f7c8::/32 space.

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 4 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS14401SolidNetwork Technologies, Inc.634
AS36236NetActuate, Inc100

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, 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 5 prefixes · 1.79K addresses IPv6 8 prefixes

CountryNamePrefixes
USUnited States of America13

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS36221
Registry name
ESOSOFT
Registrant
Esosoft Corporation
Abuse contact
hostmaster@esosoft.net
Registered
2005-10-11
Last changed
2022-12-20
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 15 valid, 0 with no ROA
ROAs
2 authorising AS36221
ASPA
no ASPA record
IRR
100% registered · 15 of 15 announcements
Route objects
20 naming AS36221

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: 442 networks and 1,773 prefixes, as published 2026-10-13. 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