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 Zayo Group
Zayo Group Holdings, Inc. is an American telecommunications company headquartered in Denver, Colorado, with European headquarters in London.
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 209.124.160.0/21 | 2.0K |
0.0%
|
Zayo Bandwidth | US | Maryland | Baltimore |
| 209.124.168.0/22 | 1.0K |
0.0%
|
Zayo Bandwidth | US | — | — |
| 128.177.93.0/24 | 256 |
96.9%
|
Zayo Bandwidth | US | — | — |
| 209.124.172.0/24 | 256 |
0.0%
|
Zayo Bandwidth | US | — | — |
| 209.124.174.0/24 | 256 |
0.0%
|
Zayo Bandwidth | US | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS33321 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 |
|---|---|---|
| 209.124.162.0/24 | 8,918 | 2026-07-25 03:39:36 |
| 128.177.93.0/24 | 7,507 | 2026-07-25 03:39:36 |
| 209.124.174.0/24 | 7,124 | 2026-07-25 03:39:36 |
| 209.124.166.0/24 | 7,111 | 2026-07-25 03:39:36 |
| 209.124.160.0/24 | 7,104 | 2026-07-25 03:39:36 |
| 209.124.160.0/20 | 7,090 | 2026-07-25 03:39:36 |
Frequently Asked Questions
What is AS33321?
AS33321 is an Autonomous System Number assigned to Zayo Bandwidth. 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 AS33321 announce?
AS33321 announces 3.8K IPv4 addresses distributed across 5 routed CIDR prefixes. The network is registered in United States.
Who operates AS33321?
AS33321 is operated by Zayo Bandwidth. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS33321 registered in?
AS33321 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
