| Full name | Sky UK Limited |
| ASN | AS5378 |
| Type | Cable / DSL ISP |
| Country | United Kingdom |
| Headquarters | Isleworth, London, UK |
| Founded | 1990 |
| Website | sky.com |
| Registry | RIPE |
| Total IPs | ~4 million (IPv4) |
| Upstream | Tier-2 — uses BT Openreach infrastructure, purchases transit |
| IPv6 | 2001:8b0::/32 |
| RIR | RIPE |
| Abuse email | abuse@sky.uk |
| Abuse form | Report abuse → |
AS5378 is Sky UK's primary ASN for its broadband service — the second-largest ISP in the UK with approximately 6.2 million broadband customers. Sky uses BT's Openreach infrastructure (copper and fibre) but operates its own backhaul network and ASN. Sky is owned by Comcast, giving it a transatlantic parent company relationship.
Every time you visit a website, your IP address — and therefore your ISP (Sky UK Limited) — is visible to that site. Sky UK Limited 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 Sky UK Limited’s ranges, websites you visit will identify your connection as coming from Sky UK Limited. 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.
AS5378 is registered with RIPE — the Regional Internet Registry responsible for IP allocations in Europe, the Middle East, and Central Asia. The ASN is used to announce IP prefixes to the global BGP routing table, allowing other networks to route traffic to Sky UK Limited’s infrastructure.
Sky UK Limited peers with major transit providers and internet exchanges to ensure global reachability. BGP peering relationships determine how traffic flows between Sky UK Limited and the rest of the internet.
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