asn.dev

Autonomous system

AS51557 TR-ISIMTESCIL-20201202 Isimtescil Bilisim A.S.

Unclassified RIPE

IPv4 addresses 7.68K 11 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

Isimtescil

Turkey · AI-generated

hosting business turkey

The AS handle TR-ISIMTESCIL-20201202 is held by Isimtescil Bilisim A.S.

What it's used for

  • The address space carries web hosting and business services, evidenced by netnames like TR-ISIMTESCIL-20100903 and ISIMTESCILBILISIM-NET, and reverse DNS entries such as winbayi4.isimtescil.net.
  • The network announces 7680 IPv4 addresses across 11 prefixes with only 1 observed neighbour, indicating a small, self-contained hosting or business network rather than a transit provider.
  • Traffic from this AS consists of web hosting endpoints and corporate services for Isimtescil, a Turkish web hosting provider.

Notable

  • Registrants for the largest prefixes are Isimtescil Bilisim A.S. and Superonline Iletisim Hizmetleri A.S., with the latter associated with Turkcell corporate support, suggesting historical or leased address space.
  • The address inventory is fragmented into multiple /24 and smaller blocks, with a mix of registrants reflecting the company's operational history and potential acquisitions.

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
AS34984Superonline Iletisim Hizmetleri A.S.681

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-02, 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 11 prefixes · 7.68K addresses IPv6 0 prefixes

CountryNamePrefixes
TRTurkey11

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS51557
Registry name
TR-ISIMTESCIL-20201202
Registrant
Isimtescil Bilisim A.S.
Abuse contact
abuse@isimtescil.net
Registered
2010-09-28
Last changed
2020-12-02
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 11 valid, 0 with no ROA
ROAs
13 authorising AS51557
ASPA
no ASPA record
IRR
36% registered · 4 of 11 announcements 1 other origin
Route objects
11 naming AS51557

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: 448 networks and 1,851 prefixes, as published 2026-11-03. 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