asn.dev

Autonomous system

AS19577 CASTRO-TELECOM

Unclassified ARIN

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

Summary

Castro Telecom LLC

United States of America · AI-generated

business small ipv6

CASTRO-TELECOM is held by Castro Telecom LLC.

What it's used for

  • The space carries a single IPv4 block with netname FEMBOY-ENTERPRISES and registrant CASTRO TELECOM LLC.
  • The AS announces 1024 IPv4 addresses and 27 IPv6 prefixes, with only 3 observed neighbours, indicating a small-scale access or internal network rather than a transit provider.

Notable

  • The registrant CASTRO TELECOM LLC matches the AS holder, though the netname FEMBOY-ENTERPRISES suggests a specific business entity or historical naming convention within the organization.
  • The address inventory consists of one IPv4 prefix (208.85.8.0/22) and a finely subdivided set of IPv6 prefixes under the 2602:faa5::/32 range.

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, 1 downstream and 3 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS62416SAMPLING LINE-SERVICOS E INTERNET, LDA60
AS200454Tomas Oliveira Valente Leite de Castro58

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-31, 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
USUnited States of America1

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS19577
Registry name
CASTRO-TELECOM
Registrant
CASTRO TELECOM LLC
Abuse contact
tomas.leite.castro@tecnico.ulisboa.pt
Registered
2024-06-14
Last changed
2025-02-27
Allocation
assigned

Declared

PeeringDB profile

self-reported
Name
CASTRO TELECOM LLC
Scope
Not Disclosed
Traffic ratio
Not Disclosed
Peering policy
Open
Website
http://tecnico.ulisboa.pt

PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 2 with no ROA
ROAs
1 authorising AS19577
ASPA
no ASPA record
IRR
100% registered · 2 of 2 announcements
Route objects
9 naming AS19577

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: 447 networks and 1,845 prefixes, as published 2026-10-31. 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