asn.dev

Autonomous system

AS51248 HOST-TELECOM

Hosting RIPE

IPv4 addresses 13.82K 19 prefixes
IPv6 prefixes 2 counted as prefixes, not addresses
Countries 1 mostly CZ
Exchanges 1 recorded by PCH
Upstreams 11 4 downstream
Flagged prefixes 0 none

Summary

Host-Telecom.com

Czechia · AI-generated

hosting datacenter cloud

The AS handle HOST-TELECOM is held by Host-Telecom.com s.r.o.

What it's used for

  • The address space carries data center and cloud infrastructure, evidenced by reverse DNS entries such as eudc.cloud and host-telecom.com, and netnames like CZ-HOST-TELECOM and HTELECOM-NET.
  • The AS announces 13,056 IPv4 addresses across 16 prefixes and 2 IPv6 prefixes, while maintaining 42 observed neighbours; this ratio of moderate address space to a high number of peers indicates a transit or interconnection role supporting its data center operations.
  • Traffic from this AS consists of web and API endpoints, cloud storage, virtual data centers, and managed services provided to professional clients.

Notable

  • Registrants for the majority of prefixes align with the announcer, specifically Host-Telecom.com s.r.o. and HOST TELECOM ABUSE TEAM, though some smaller blocks are registered to third parties like Fiber Ltd and VEKTOR-AITI-TEKHNOLOGII-NOC.
  • The address inventory is composed of a mix of /21 and /24 blocks, with the largest allocations being /21s, reflecting a segmented corporate estate for its data center facilities.

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

Recorded at 1 exchange in 1 country, largest first.

ExchangeLocationTheir address
NIX.CZ - Neutral Internet eXchange for the Czech RepublicPrague, Czech Republic91.210.16.177

Transit providers

11 upstream, 4 downstream and 25 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS1299Arelion Sweden AB350
AS9002RETN Limited279
AS6939Hurricane Electric LLC198
AS3223Voxility LLP166
AS174Cogent Communications, LLC156
AS3257GTT Communications Inc.90
AS24482SG.GS24
AS29504Freenet Liberec, z.s.24

All 11 upstreams →

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-10, 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 19 prefixes · 13.82K addresses IPv6 2 prefixes

CountryNamePrefixes
CZCzechia21

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS51248
Registry name
HOST-TELECOM
Registrant
ALSAUT-MNT
Abuse contact
abuse@host-telecom.cz
Registered
2010-06-30
Last changed
2026-09-30
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
96% valid · 24 valid, 1 with no ROA
ROAs
28 authorising AS51248
ASPA
no ASPA record
IRR
100% registered · 25 of 25 announcements
Route objects
46 naming AS51248

Reputation

Classification and threat

Hosting Datacenter or cloud provider. Addresses are servers, not people.

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: 431 networks and 1,775 prefixes, as published 2026-10-11. 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