asn.dev

Autonomous system

AS20836 CDLAN-AS Milano

Hosting RIPE

IPv4 addresses 26.11K 21 prefixes
IPv6 prefixes 4 counted as prefixes, not addresses
Countries 1 mostly IT
Exchanges 3 recorded by PCH
Upstreams 12 10 downstream
Flagged prefixes 0 none

Summary

CDLAN

Italy · AI-generated

isp residential italy access

CDLAN-AS is operated by CDLAN SpA, an Italian internet service provider.

What it's used for

  • The address space carries residential and business access traffic, evidenced by reverse DNS entries such as ip0-36.dialup.cdlan.net and wireless-uffici-static-254.cdlan.net.
  • The AS announces 26,112 IPv4 addresses across 21 prefixes and 4 IPv6 prefixes, while maintaining 59 observed neighbours; this ratio of address space to peering partners is characteristic of an access network providing last-mile connectivity.

Notable

  • Registrants for the majority of prefixes are consistent with the announcer, listing CDLAN SpA and CDLAN LIR CONTACT for netnames like IT-ISPCDLAN-20090401 and IT-ISPCDLAN-20010330.
  • The address inventory is finely subdivided into multiple /22, /23, and /24 blocks, indicating a segmented internal estate rather than a single large contiguous allocation.
  • Two prefixes show different registrants: 185.164.176.0/23 is registered to Abuse-C Role with netname overweb-c21, and 5.253.198.0/24 is registered to Altea 365 S.r.l. with netname IT-LAKEWEB-20190211.

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 3 exchanges in 1 country, largest first.

ExchangeLocationTheir address
Milan Internet ExchangeMilan, Italy217.29.66.16
Torino Piemonte Exchange PointTorino, Italy194.116.96.86
Milan Neutral Access PointMilan, Italy185.1.114.5

Transit providers

12 upstream, 10 downstream and 34 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS3356Level 3 Parent, LLC491
AS1299Arelion Sweden AB193
AS6939Hurricane Electric LLC192
AS6762TELECOM ITALIA SPARKLE S.p.A.136
AS3303Swisscom (Schweiz) AG35
AS24482SG.GS21
AS31543myNet GmbH20
AS174Cogent Communications, LLC16

All 12 upstreams →

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-10, 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 21 prefixes · 26.11K addresses IPv6 4 prefixes

CountryNamePrefixes
ITItaly25

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS20836
Registry name
CDLAN-AS
Registrant
MNT-CDLAN
Abuse contact
lirabuse@cdlan.it
Registered
1970-01-01
Last changed
2026-06-29
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
62% valid · 13 valid, 8 with no ROA
ROAs
17 authorising AS20836
ASPA
no ASPA record
IRR
100% registered · 21 of 21 announcements
Route objects
26 naming AS20836

Reputation

Classification and threat

Hosting Datacenter or cloud provider. Addresses are servers, not people.

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: 431 networks and 1,775 prefixes, as published 2026-10-11. 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