Mystery CDN

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1

I'm struggling to determine which CDN owns the servers in CenturyLink prefix 8.240.0.0/12. During the Call of Duty Season 4 update on June 11th from 06:00 UTC until 08:30 UTC, we had 240 Gbps of traffic steaming into our network from CenturyLink prefix 8.240.0.0/12. We originally thought it was Akamai, but they swear up and down that the servers don't belong to them.

Here are some of the HTTP/HTTPS servers in 8.240.0.0/12:
8.253.151.248
8.251.135.126
8.240.167.126
8.240.228.126
8.240.168.126
8.240.126.254
8.240.191.254

2

You might ask Level3.

3

* clinton@scripty.com (Clinton Work) [Wed 17 Jun 2020, 17:31 CEST]:

I'm struggling to determine which CDN owns the servers in CenturyLink prefix 8.240.0.0/12. During the Call of Duty Season 4 update on June 11th from 06:00 UTC until 08:30 UTC, we had 240 Gbps of traffic steaming into our network from CenturyLink prefix 8.240.0.0/12. We originally thought it was Akamai, but they swear up and down that the servers don't belong to them.

Akamai:

% curl -sv http://95.100.96.208/ |& fgrep Server:
< Server: AkamaiGHost

Here are some of the HTTP/HTTPS servers in 8.240.0.0/12:
8.253.151.248
8.251.135.126
8.240.167.126
8.240.228.126
8.240.168.126
8.240.126.254
8.240.191.254

Not Akamai:

% curl -sv http://8.240.191.254/ |& fgrep Server:
< Server: FP6.1.1866.55

Have you tried a Shodan search for this fingerprint?

HTH,

  -- Niels.

4

Former Level3 operates a CDN. Might be worth looking into.

5

Using Shodan, we can find other nodes belonging to the same CDN by searching for “FP6.1.1866.55”, which is conveniently present in the “Server” HTTP header.

Skimming through the results, it would appear most of the nodes are on the Level 3 network. Picking one non-Level3 node at random (192.67.191.173) and doing an rDNS lookup reveals the following:

173.191.67.192.in-addr.arpa. 3600 IN PTR LEVEL3-CDN-192-67-191-173.de.kpn-eurorings.net.

There’s your answer. “Level 3 CDN”.

Kind Regards,
Filip Hruska