asn.dev

Autonomous system

AS205718 ALCORT ALCORT INGENIERIA Y ASESORIA S.L.

Residential RIPE

IPv4 addresses 9.22K 9 prefixes
IPv6 prefixes 9 counted as prefixes, not addresses
Countries 1 mostly ES
Exchanges 2 recorded by PCH
Upstreams 5 1 downstream
Flagged prefixes 0 none

Summary

Alcort

Spain · AI-generated

isp fiber regional telecom

ALCORT is operated by Alcort Ingeniería y Asesoría S.L.

What it's used for

  • The address space carries regional fiber optic and telecommunications infrastructure, evidenced by registrants like SEROSENSE TELECOM S.L.U., CECSA TELECOM S.L.U., and Inpecuarias Fibra S.L.
  • With 9216 IPv4 addresses and 17 observed neighbours, the ratio indicates a regional access network rather than a transit provider
  • Traffic consists of subscriber eyeballs and business endpoints connected via fiber optic deployments in Spain

Notable

  • Registrants vary across the announced prefixes, including Alset Servicios SL, REDJAM TELECOM SLU, and ADURIZ ENERGIA SLU, suggesting a multi-entity or leased space arrangement under the Alcort AS
  • The inventory consists of nine /22 IPv4 blocks and nine IPv6 prefixes, all located in Spain

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 2 exchanges in 1 country, largest first.

ExchangeLocationTheir address
DE-CIX MadridMadrid, Spain185.1.192.149
ESpanix Madrid Lower LANMadrid, Spain193.149.1.59

Transit providers

5 upstream, 1 downstream and 7 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS6939Hurricane Electric LLC862
AS12479Orange Espagne SA33
AS29632Netassist International EOOD18
AS33891Core-Backbone GmbH7
AS37721Virtual Technologies & Solutions7

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 9 prefixes · 9.22K addresses IPv6 9 prefixes

CountryNamePrefixes
ESSpain18

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS205718
Registry name
ALCORT
Registrant
es-alcort-ing-1-mnt
Abuse contact
abuse@alcort.es
Registered
2017-06-16
Last changed
2023-02-10
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 18 valid, 0 with no ROA
ROAs
18 authorising AS205718
ASPA
no ASPA record
IRR
100% registered · 18 of 18 announcements
Route objects
19 naming AS205718

Reputation

Classification and threat

Residential Fixed-line consumer ISP. Addresses here are homes.

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