AS7767 — EB - Encyclopaedia Britannica

AS7767 announces 2 IPv4 prefixes covering 512 addresses and 1 IPv6 prefixes.

About this network

Autonomous System 7767 (EB) belongs to Encyclopaedia Britannica, the Chicago-based reference publisher — today primarily a digital education and reference business rather than a printer of books.

What it's used for

• Carrying Britannica's own online estate: the britannica.com reference site, its education products, and the corporate systems behind them.
• Announcing two /24s and a /48 of IPv6 — a few hundred IPv4 addresses in total.

Notable

• Both IPv4 prefixes are provider-assigned space, carved out of AboveNet / Zayo ranges (208.184.0.0/15 and 64.124.0.0/16) rather than being Britannica's own legacy allocations. Britannica holds the ASN and announces the prefixes, but the underlying addresses are registered to the carrier.
• This is enterprise space: a publisher running its own website and back office. It is not hosting, not an access network, and there are no third-party tenants in the range.

Interesting

• Britannica stopped printing its flagship set in 2012 after 244 years, pivoting entirely to digital. The ASN is a small artefact of that transition: a centuries-old publisher that needed to become, and stay, a website — and chose to hold its own AS number and multihome rather than sit behind a single provider.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 64.124.231.0/24
• 208.185.238.0/24
• 2620:105:c000::/48

Upstream networks

• AS33491 Comcast Cable Communications, LLC
• AS6461 Zayo Bandwidth
• AS767 United States Department of Defense (DoD)

Adjacent networks

• AS33491 Comcast Cable Communications, LLC
• AS6461 Zayo Bandwidth
• AS767 United States Department of Defense (DoD)

Routing security

• RPKI: 2 valid, 0 invalid and 1 not-found announcements; 2 ROAs.
• ASPA: none published.
• IRR: 33% of announcements registered; 2 route objects.
• Listed in as-sets: AS-COMCAST-EDIA, AS-PSINETUS-MC, AS26554:AS-CUSTOMERS.