AS19855
Masergy Communications, Inc.
Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
- Baseline (neutral) 65
- Isp allocation +5
- Trust score 70 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
About Masergy Communications
Masergy Communications is a software-defined networking services company founded in 2000 and headquartered in Plano, Texas. The services they provide include Managed SD-WAN, Unified Communications, Cloud Contact Center, and Managed Security.
AS19855 — global IP footprint
Cities where AS19855 has measurable IPv4 allocation. Click any dot to open that city's page. Size and color scale with IP count.
Top CIDR ranges
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS19855 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 169.143.243.0/24 | 24,997 | 2026-07-18 12:00:02 |
| 140.242.146.0/24 | 12,188 | 2026-07-18 11:59:36 |
| 64.138.20.0/22 | 11,958 | 2026-07-18 11:59:58 |
| 64.138.8.0/23 | 11,957 | 2026-07-18 11:59:58 |
| 65.96.128.0/18 | 11,950 | 2026-07-18 11:59:56 |
| 65.96.0.0/18 | 11,226 | 2026-07-18 12:27:43 |
| 64.138.128.0/18 | 10,169 | 2026-07-18 12:27:12 |
| 64.138.0.0/17 | 10,142 | 2026-07-18 12:27:12 |
| 64.138.4.0/23 | 8,276 | 2026-07-18 12:26:29 |
| 64.138.140.0/22 | 8,236 | 2026-07-18 12:27:11 |
| 64.138.144.0/22 | 8,210 | 2026-07-18 12:27:11 |
| 64.138.10.0/23 | 8,192 | 2026-07-18 12:27:11 |
| 64.138.26.0/24 | 8,100 | 2026-07-18 12:27:11 |
| 64.138.128.0/22 | 8,097 | 2026-07-18 12:27:11 |
| 64.138.6.0/23 | 8,012 | 2026-07-18 12:27:12 |
| 64.47.218.0/24 | 8,009 | 2026-07-18 12:12:42 |
| 64.138.2.0/23 | 7,945 | 2026-07-18 12:27:12 |
| 64.138.134.0/24 | 7,844 | 2026-07-18 12:00:00 |
| 64.138.150.0/24 | 7,795 | 2026-07-18 12:00:00 |
| 64.138.156.0/22 | 7,554 | 2026-07-18 12:27:11 |
| 64.47.253.0/24 | 7,139 | 2026-07-18 11:59:54 |
| 64.47.27.0/24 | 6,325 | 2026-07-18 11:59:56 |
| 64.47.46.0/24 | 6,299 | 2026-07-18 11:59:55 |
| 64.47.216.0/24 | 6,286 | 2026-07-18 11:59:55 |
| 64.47.217.0/24 | 6,266 | 2026-07-18 11:59:55 |
| 204.139.40.0/24 | 6,264 | 2026-07-18 10:52:51 |
| 64.138.149.0/24 | 6,251 | 2026-07-18 12:00:01 |
| 74.116.49.0/24 | 6,240 | 2026-07-18 11:59:36 |
| 64.47.164.0/22 | 6,218 | 2026-07-18 11:59:56 |
| 64.138.133.0/24 | 6,217 | 2026-07-18 12:00:01 |
| 64.47.88.0/22 | 6,217 | 2026-07-18 11:59:56 |
| 64.47.56.0/23 | 6,206 | 2026-07-18 11:59:56 |
| 64.47.43.0/24 | 6,202 | 2026-07-18 11:59:56 |
| 64.47.107.0/24 | 6,191 | 2026-07-18 11:59:56 |
| 64.47.238.0/24 | 6,186 | 2026-07-18 11:59:54 |
| 204.139.45.0/24 | 6,126 | 2026-07-18 10:52:51 |
| 204.139.49.0/24 | 6,125 | 2026-07-18 10:52:51 |
| 64.47.50.0/23 | 5,882 | 2026-07-18 11:59:58 |
| 64.47.48.0/24 | 5,870 | 2026-07-18 11:59:58 |
| 64.47.235.0/24 | 5,859 | 2026-07-18 11:59:58 |
| 45.45.151.0/24 | 5,669 | 2026-07-18 11:59:36 |
| 64.138.137.0/24 | 5,582 | 2026-07-18 11:59:56 |
| 64.47.233.0/24 | 5,545 | 2026-07-18 11:59:56 |
| 64.138.153.0/24 | 5,514 | 2026-07-18 11:59:56 |
| 64.47.105.0/24 | 5,505 | 2026-07-18 11:59:56 |
| 64.47.224.0/22 | 5,363 | 2026-07-18 11:59:54 |
| 64.47.112.0/22 | 5,315 | 2026-07-18 11:59:54 |
| 64.47.21.0/24 | 5,253 | 2026-07-18 12:00:00 |
| 64.47.187.0/24 | 5,248 | 2026-07-18 12:00:00 |
| 64.47.188.0/22 | 5,226 | 2026-07-18 11:59:54 |
Showing top 50 of 98 announced prefixes by sample volume.
Frequently Asked Questions
What is AS19855?
AS19855 is an Autonomous System Number assigned to Masergy Communications, Inc.. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).
How many IP addresses does AS19855 announce?
AS19855 announces 157.4K IPv4 addresses distributed across 53 routed CIDR prefixes. The network is registered in United States.
Who operates AS19855?
AS19855 is operated by Masergy Communications, Inc.. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS19855 registered in?
AS19855 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
