| Full name | Fastly Inc. |
| ASN | AS54113 |
| Type | CDN Provider |
| Country | United States |
| Headquarters | San Francisco, California, US |
| Founded | 2011 |
| Website | fastly.com |
| Registry | ARIN |
| Total IPs | ~131,000 (IPv4) |
| Upstream | Multiple Tier-1 providers with heavy IXP peering |
| IPv6 | 2a04:4e40::/32, 2a04:4e42::/32 |
| RIR | ARIN |
| Abuse email | abuse@fastly.com |
| Abuse form | Report abuse → |
AS54113 is Fastly's CDN network used by Reddit, GitHub, Stack Overflow, npm, The Guardian, Financial Times, and many other major websites. Fastly is known for its real-time CDN configuration and edge computing capabilities. In June 2021, a single misconfigured customer triggered a global Fastly outage that took down major portions of the internet for approximately one hour — demonstrating how critical AS54113 is to internet infrastructure.
Every time you visit a website, your IP address — and therefore your ISP (Fastly Inc.) — is visible to that site. Fastly Inc. as your ISP can see all unencrypted traffic passing through their network, including the domains you visit. This is standard practice for all ISPs and is typically used for network management, legal compliance, and in some cases targeted advertising.
If your device is assigned an IP in Fastly Inc.’s ranges, websites you visit will identify your connection as coming from Fastly Inc.. To prevent this, a VPN replaces your ISP-assigned IP with the VPN server’s IP, making your traffic appear to come from a different provider entirely.
AS54113 is registered with ARIN — the Regional Internet Registry responsible for IP allocations in North America. The ASN is used to announce IP prefixes to the global BGP routing table, allowing other networks to route traffic to Fastly Inc.’s infrastructure.
Fastly Inc. peers with major transit providers and internet exchanges to ensure global reachability. BGP peering relationships determine how traffic flows between Fastly Inc. and the rest of the internet.
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