asn.dev

Autonomous system

AS48451 PRE-AS

Unclassified RIPE

IPv4 addresses 2.05K 1 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly CZ
Exchanges 1 recorded by PCH
Upstreams 8 0 downstream
Flagged prefixes 0 none

Summary

Pražská energetika

Czechia · AI-generated

utility corporate czechia

The AS handle PRE-AS is held by Pražská energetika, a.s.

What it's used for

  • The space carries corporate infrastructure for a major Czech electricity producer and distributor, evidenced by the netname CZ-PRE-20080728 and registrants including Prazska energetika, a.s. and PRE Hostmaster.
  • The AS announces 2048 IPv4 addresses in a single /21 prefix and 1 IPv6 prefix, while maintaining 21 observed neighbours; this ratio of modest address space to significant peering indicates a business network with substantial external connectivity rather than a transit provider.
  • Traffic from this AS consists of internal corporate systems, data center operations, and utility control networks supporting the company's power generation and distribution activities in Prague.

Notable

  • Registrants align with the announcer, listing ICZ Hostmaster, Prazska energetika, a.s., PRE Hostmaster, and Abuse-C Role for the primary prefix.
  • The address inventory is compact and consolidated into a single IPv4 block, typical of a large enterprise managing its own IP estate rather than an access provider.

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 Republic91.210.16.30

Transit providers

8 upstream, 0 downstream and 16 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS21430WIA spol. s.r.o.36
AS6939Hurricane Electric LLC23
AS5610O2 Czech Republic, a.s.12
AS6855Slovak Telekom, a.s.12
AS1764Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH2
AS8218Zayo Infrastructure France SA2
AS24482SG.GS2
AS29504Freenet Liberec, z.s.2

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-16, 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 1 prefixes · 2.05K addresses IPv6 1 prefixes

CountryNamePrefixes
CZCzechia2

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS48451
Registry name
PRE-AS
Registrant
Prazska energetika, a.s.
Abuse contact
abuse@pre.cz
Registered
2008-11-27
Last changed
2023-10-23
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 2 valid, 0 with no ROA
ROAs
2 authorising AS48451
ASPA
no ASPA record
IRR
100% registered · 2 of 2 announcements
Route objects
2 naming AS48451

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 1,783 prefixes, as published 2026-10-17. 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