asn.dev

Autonomous system

AS209441 TEKFEN Tekfen Holding Anonim Sirketi

Unclassified RIPE

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

Summary

Tekfen Holding

Turkey · AI-generated

business corporate turkey

The AS handle TEKFEN is held by Tekfen Holding Anonim Sirketi.

What it's used for

  • The address space carries corporate infrastructure, identified by the netname TR-TEKFEN1-20190211 and registrant Tekfen Holding Anonim Sirketi.
  • The inventory consists of 1024 IPv4 addresses within a single /22 prefix (5.253.220.0/22) and 0 IPv6 prefixes.
  • With only 2 observed neighbours, the low neighbour count relative to the address block indicates an internal corporate estate rather than a transit or access network.
  • Traffic from this AS represents office workers and internal systems for a conglomerate operating in engineering, contracting, agriculture, and investment.

Notable

  • The RDAP registrant Tekfen Holding Anonim Sirketi matches the AS holder and the netname owner.
  • Tekfen Holding is a major Turkish conglomerate listed on the BIST 100, comprising 38 companies across engineering, agriculture, and investment sectors.
  • The address inventory is a single contiguous /22 block, typical for a corporate site or headquarters network.

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 1 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS15924Vodafone Net Iletisim Hizmetler AS248

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-12, 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 0 prefixes

CountryNamePrefixes
TRTurkey1

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS209441
Registry name
TEKFEN
Registrant
mnt-tr-tekfen1-1
Abuse contact
tekfenholding.licences@tekfen.com.tr
Registered
2019-02-11
Last changed
2019-02-11
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 4 valid, 0 with no ROA
ROAs
4 authorising AS209441
ASPA
no ASPA record
IRR
100% registered · 4 of 4 announcements
Route objects
1 naming AS209441

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: 453 networks and 1,848 prefixes, as published 2026-11-13. 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