Overview
Zayo Group operates a transit or backbone network associated with AS6461.
This record includes the representative IPv4 CIDR 209.66.64.0/18. It is not an exhaustive list of the network’s address space or current routing announcements.
This is a network-origin record, not an exact physical-facility location or proof that a request is automated. Evaluate the ASN and CIDR together with the User-Agent, request path, request rate, session behavior, and application context before enforcement.
Network prefixes
These are documented prefixes associated with this routed network. They are not necessarily the network’s complete current address space.
- Representative prefix
-
209.66.64.0/18
IPv4 · Active · RPKI Valid · checked 2026-08-07
Provider and network
- Network / Provider Name
- Zayo Group
- Registered / Operating Organization
- Zayo Group Holdings, Inc.
- ISP / Network Operator
- Zayo Group Holdings, Inc.
- ASN
-
AS6461 - ASN Name
- MFNX
- Network Name
- ZAYO-6461
- Current Services
- Bandwidth, transit, backbone, enterprise network services
- Provider Type
- Transit carrier
- Network Type
- Transit backbone
Network scope
- Network Country
- US
Traffic and handling
- Traffic Classification
- Network Infrastructure Traffic
- Traffic Label
- Transit / Carrier
- Risk Level
- Low
- Recommended Action
- Use for routing context only. Do not block a transit ASN or representative backbone range as though it identifies the originating customer.
- Default Rule Action
- Log
- Common Pattern
- Transit and backbone ranges provide routing context and may carry traffic for many unrelated downstream networks.
- Detection Notes
- Use AS6461 and representative CIDR 209.66.64.0/18 as routing context. Confirm the actual origin network, request identity, and behavior before enforcement.
Relationships
- Operator
- Zayo Group Holdings, Inc. Evidence Checked 2026-08-07