asn.dev

Autonomous system

AS19643 NETSYN - Network Synergy Corporation

Unclassified ARIN

IPv4 addresses 1.79K 7 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 3 0 downstream
Flagged prefixes 0 none

Summary

Network Synergy

United States of America · AI-generated

business legacy enterprise

The AS handle NETSYN is held by Network Synergy Corporation.

What it's used for

  • The address space carries a mix of legacy Sprint and Cogent blocks, with netnames including SPRINT-CDA006-1, SPRINT-CDF612, SPRINT-CF2977, SPRINT-D01CB0, and COGC.
  • The reverse DNS sample shows syn-071-088-062-064.biz.spectrum.com, indicating the space supports business customer connections via Spectrum infrastructure.
  • With 1792 IPv4 addresses announced across 7 prefixes and only 3 observed neighbours, the low neighbour count suggests a limited peering footprint typical of a small business or internal corporate network rather than a transit provider.

Notable

  • Registrants vary across the inventory: Charter Communications LLC holds the largest block, Network Synergy holds four blocks, and Cogent Communications, LLC holds one block.
  • The address inventory consists of seven /24 prefixes, all located in the United States, with no IPv6 prefixes announced.
  • The presence of Sprint and Cogent netnames alongside the Network Synergy registrant reflects historical address space transfers or 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

3 upstream, 0 downstream and 3 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS23132Charter Communications LLC192
AS174Cogent Communications, LLC141
AS46887Crown Castle Fiber LLC104

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-03, 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 7 prefixes · 1.79K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America7

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS19643
Registry name
NETSYN
Registrant
Network Synergy Corporation
Abuse contact
dgargano@netsynergy.com
Registered
2001-01-29
Last changed
2012-03-02
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
14% valid · 1 valid, 6 with no ROA
ROAs
1 authorising AS19643
ASPA
no ASPA record
IRR
86% registered · 6 of 7 announcements 1 other origin
Route objects
7 naming AS19643

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: 451 networks and 1,853 prefixes, as published 2026-11-04. 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