asn.dev

Autonomous system

AS20145 FCS - FLORIDA CANCER SPECIALISTS, P.L.

Unclassified ARIN

IPv4 addresses 512 2 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

Florida Cancer Specialists

United States of America · AI-generated

business healthcare corporate

The AS handle FCS is held by Florida Cancer Specialists, P.L.

What it's used for

  • The address space carries corporate infrastructure for a medical oncology and hematology practice, as indicated by registrant names FLORIDA CANCER SPECIALISTS and netnames QWEST-TPF-FCS1 and FCSP-2.
  • The AS announces 512 IPv4 addresses across 2 prefixes with 2 observed neighbours, a ratio consistent with a small internal corporate estate rather than a transit or access network.

Notable

  • Registrants align with the announcer, with both prefixes registered to FLORIDA CANCER SPECIALISTS or FLORIDA CANCER SPECIALISTS, P.L.
  • The inventory consists of two /24 blocks, one of which retains reverse DNS pointing to dia.static.qwest.net, reflecting the underlying Qwest infrastructure.

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, 0 downstream and 2 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS33363Charter Communications, Inc76
AS209CenturyLink Communications, LLC48

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-08, 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 2 prefixes · 512 addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America2

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS20145
Registry name
FCS
Registrant
FLORIDA CANCER SPECIALISTS, P.L.
Abuse contact
network_services@flcancer.com
Registered
2007-09-04
Last changed
2012-02-24
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 2 with no ROA
ROAs
0 authorising AS20145
ASPA
no ASPA record
IRR
100% registered · 2 of 2 announcements
Route objects
2 naming AS20145

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: 455 networks and 1,854 prefixes, as published 2026-11-09. 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