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
- Enterprise allocation +4
- Trust score 69 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
About Webex by Cisco
Webex by Cisco is an American subsidiary of Cisco Systems that develops and sells web conferencing, videoconferencing and contact center as a service applications. It was founded as WebEx Communications, Inc., in 1995 and acquired by Cisco Systems in May 2007.
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 139.177.84.0/22 | 1.0K |
0.0%
|
Cisco Webex LLC | US | — | — |
| 139.177.88.0/22 | 1.0K |
0.0%
|
Cisco Webex LLC | US | — | — |
| 139.177.84.0/23 | 512 |
0.0%
|
Cisco Webex LLC | SA | Mecca Region | Jeddah |
| 139.177.86.0/23 | 512 |
0.0%
|
Cisco Webex LLC | GB | — | — |
| 139.177.88.0/23 | 512 |
0.0%
|
Cisco Webex LLC | US | — | — |
| 139.177.92.0/23 | 512 |
0.0%
|
Cisco Webex LLC | US | — | — |
| 158.222.48.0/23 | 512 |
0.0%
|
Cisco Webex LLC | US | — | — |
| 8.38.216.0/24 | 256 |
0.0%
|
Cisco Webex LLC | US | — | — |
| 139.177.90.0/24 | 256 |
0.0%
|
Cisco Webex LLC | NL | — | — |
| 139.177.91.0/24 | 256 |
0.0%
|
Cisco Webex LLC | US | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS399937 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 |
|---|---|---|
| 139.177.85.0/24 | 31,523 | 2026-07-24 09:45:35 |
| 139.177.84.0/24 | 15,734 | 2026-07-24 09:45:35 |
| 139.177.93.0/24 | 13,385 | 2026-07-24 10:02:10 |
| 139.177.92.0/24 | 12,408 | 2026-07-24 10:02:10 |
| 139.177.91.0/24 | 8,462 | 2026-07-24 09:46:14 |
| 139.177.86.0/24 | 4,088 | 2026-07-24 09:59:15 |
| 8.38.216.0/24 | 3,933 | 2026-07-24 09:45:18 |
| 158.222.48.0/24 | 3,517 | 2026-07-24 09:45:18 |
| 139.177.88.0/24 | 3,446 | 2026-07-24 09:45:18 |
| 158.222.49.0/24 | 3,445 | 2026-07-24 09:45:18 |
| 139.177.89.0/24 | 3,388 | 2026-07-24 09:45:18 |
| 139.177.87.0/24 | 3,366 | 2026-07-24 09:45:18 |
| 139.177.90.0/24 | 3,119 | 2026-07-24 09:45:18 |
Frequently Asked Questions
What is AS399937?
AS399937 is an Autonomous System Number assigned to Cisco Webex LLC. 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 AS399937 announce?
AS399937 announces 3.3K IPv4 addresses distributed across 5 routed CIDR prefixes. The network is registered in United States.
Who operates AS399937?
AS399937 is operated by Cisco Webex LLC. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS399937 registered in?
AS399937 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
