Autonomous system
AS19855 MASERGY
Unclassified ARIN
Summary
Masergy Communications
business sd-wan managed-services
The AS handle MASERGY is held by Masergy Communications, Inc.
What it's used for
- The address space carries managed enterprise networking infrastructure, evidenced by netnames like
MASERGY-BLK1andMSGY-BLK2and reverse DNS entries pointing tomasergy.com. - With 157,440 IPv4 addresses announced across 117 prefixes and 25 observed neighbours, the ratio indicates a business-focused network providing SD-WAN and cloud connectivity services rather than a large-scale residential access provider.
Notable
- Registrants for the majority of prefixes align with the announcer, listing Masergy Communications, Inc., though two large /18 blocks are registered to Comcast Cable Communications, LLC.
- Masergy was acquired by Comcast Business in 2021, explaining the presence of Comcast-registered prefixes within the autonomous system.
- The inventory includes a mix of large /18 and /19 blocks alongside numerous smaller /21 and /22 prefixes, reflecting a segmented corporate estate.
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
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
8 upstream, 16 downstream and 32 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS3356 | Level 3 Parent, LLC | 3,609 |
| AS7922 | Comcast Cable Communications, LLC | 853 |
| AS3491 | PCCW Global (HK) Ltd. | 588 |
| AS7473 | Singapore Telecommunications Ltd | 331 |
| AS12956 | TELEFONICA GLOBAL SOLUTIONS SL | 231 |
| AS7474 | SingTel Optus Pty Ltd | 185 |
| AS33491 | Comcast Cable Communications, LLC | 180 |
| AS174 | Cogent Communications, LLC | 55 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-16, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 117 prefixes · 157K addresses IPv6 5 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 122 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS19855- Registry name
- MASERGY
- Registrant
- Masergy Communications, Inc.
- Abuse contact
- abuse@masergy.com
- Registered
- 2001-02-21
- Last changed
- 2012-03-02
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 4% valid · 4 valid, 99 with no ROA
- ROAs
- 7 authorising AS19855
- ASPA
- no ASPA record
- IRR
- 88% registered · 91 of 103 announcements
- Route objects
- 79 naming AS19855
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: 442 networks and 1,783 prefixes, as published 2026-10-17. 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