IPDebrief IP Intelligence Authority Platform

Fastly IP ranges

CDN and edge networks

Fastly uses 21 IPv4 blocks, covering about 353,280 unique IPv4 addresses, announced from AS54113. IPDebrief has analysed 522 addresses in these ranges; 70 (13%) currently carry a higher risk score.

IPv4 blocks
21
Unique IPv4 addresses
353,280
Analysed addresses
522
Higher risk
13%

Range data updated 2026-11-07

About Fastly

Fastly is an edge cloud and CDN used by major publishers, e-commerce sites and developer platforms. It publishes the ranges its edge servers use to connect to customer origins, which origin firewalls use to accept only CDN traffic.

What traffic from Fastly addresses usually means

Traffic from Fastly ranges to an origin server is normally proxied requests from visitors of a Fastly-fronted site, or requests from code running on Fastly's edge. The individual visitor is identified by forwarding headers, not by the Fastly address.

How to verify a Fastly IP address

Allow Fastly's published ranges at your origin and read the visitor address from the forwarding header only for connections that arrive from those ranges.

Largest Fastly IPv4 ranges

Fastly networks (ASNs)

Recently analysed Fastly addresses

70 higher risk115 moderate337 lower risk

Frequently asked questions

How many IP addresses does Fastly have?

Fastly uses 21 IPv4 address blocks. After merging overlapping ranges, the IPv4 blocks cover about 353,280 unique addresses. Counts change as the provider adds, retires or transfers address space.

How can I check if an IP address belongs to Fastly?

Enter the address in the IPDebrief IP lookup. If it falls inside one of Fastly's ranges, the profile names the provider alongside the announcing network, location and risk signals. Allow Fastly's published ranges at your origin and read the visitor address from the forwarding header only for connections that arrive from those ranges.

Which ASN does Fastly use?

Fastly announces its address space from AS54113. An autonomous system number identifies the network that routes the addresses on the internet; each ASN page lists the analysed addresses observed in that network.

Is traffic from Fastly IP addresses safe?

Traffic from Fastly ranges to an origin server is normally proxied requests from visitors of a Fastly-fronted site, or requests from code running on Fastly's edge. The individual visitor is identified by forwarding headers, not by the Fastly address. Of the 522 Fastly addresses IPDebrief has analysed, 70 (13%) currently score as higher risk, so judge each address on its own profile.

Where does this IP range data come from?

Ranges are compiled from address lists the operator publishes and from global routing data, refreshed regularly. Address-level risk comes from independent observations of each address, recomputed in the background.

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