asn.dev

Autonomous system

AS41981 FCIO

Unclassified RIPE

IPv4 addresses 1.02K 1 prefixes
IPv6 prefixes 3 counted as prefixes, not addresses
Countries 1 mostly DE
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

Flying Circus Internet Operations

Germany · AI-generated

hosting devops nixos germany

The AS handle FCIO is operated by Flying Circus Internet Operations GmbH.

What it's used for

  • The address space carries infrastructure for a DevOps and hosting provider, with the netname DE-FCIO-20150624 and registrant FCIO NOC; Flying Circus Internet Operations GmbH.
  • The AS announces 1024 IPv4 addresses and 3 IPv6 prefixes, maintaining only 2 observed neighbours, which indicates a hosting or service provider role rather than a transit network.
  • Traffic from this AS consists of web and API endpoints, managed application infrastructure, and DevOps services for development teams, consistent with the company's provision of secure, stable, and flexible hosting solutions based on open source and NixOS.

Notable

  • The registrant FCIO NOC; Flying Circus Internet Operations GmbH aligns directly with the AS holder and the AS handle FCIO.
  • The address inventory is compact, consisting of a single IPv4 prefix 185.105.252.0/22 and three IPv6 prefixes, reflecting a focused corporate estate for its hosting and DevOps operations.

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
AS8648dogado GmbH217
AS5405Inter.link GmbH163

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-17, 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 · 1.02K addresses IPv6 3 prefixes

CountryNamePrefixes
DEGermany4

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS41981
Registry name
FCIO
Registrant
de-fcio-1-mnt
Abuse contact
support@flyingcircus.io
Registered
2018-05-24
Last changed
2024-01-10
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 8 valid, 0 with no ROA
ROAs
8 authorising AS41981
ASPA
2 declared providers
IRR
100% registered · 8 of 8 announcements
Route objects
8 naming AS41981

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