asn.dev

Autonomous system

AS210958 FASTPORT Fastport a.s.

Unclassified RIPE

IPv4 addresses 4.10K 2 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly CZ
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

Fastport

Czechia · AI-generated

isp residential czech fiber

The AS handle FASTPORT is operated by Fastport a.s.

What it's used for

  • The address space carries residential and business internet access, evidenced by reverse DNS records pointing to fastportnet.cz and netnames CZ-FASTPORT-20101217 and CZ-FASTPORT-20080513.
  • The network announces 4096 IPv4 addresses across 2 prefixes and 1 IPv6 prefix, with only 1 observed routing neighbour, indicating a local access provider rather than a transit hub.
  • Traffic from this AS consists of subscriber eyeballs and local business endpoints within the Czech Republic, specifically in regions like Pardubice.

Notable

  • Registrants for both announced prefixes are consistently listed as Fastport hostmasters and Fastport a.s., matching the AS holder.
  • The address inventory is compact, consisting of two /21 blocks in the 46.254.64.0 and 93.190.56.0 ranges, typical for a regional ISP.

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

1 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS42306CEZNET s.r.o.154

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-01, 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 · 4.10K addresses IPv6 1 prefixes

CountryNamePrefixes
CZCzechia3

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS210958
Registry name
FASTPORT
Registrant
MNT-FASTPORT
Abuse contact
jan.drobny@fastport.cz
Registered
2021-08-03
Last changed
2021-08-03
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 3 valid, 0 with no ROA
ROAs
3 authorising AS210958
ASPA
no ASPA record
IRR
100% registered · 3 of 3 announcements
Route objects
3 naming AS210958

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: 449 networks and 1,846 prefixes, as published 2026-11-02. 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