AS8943 JUMP

JUMP is Jump Networks Ltd, a long-running British provider of IP bandwidth and server colocation, operating out of IP House and Telehouse North in London Docklands. The company is registered in Cambridge and has been trading since 2000.

What it's used for

• Colocation and hosting. The rDNS across its own 212.13.192.0/19, 185.73.44.0/22 and 185.98.212.0/23 mixes Jump's own infrastructure (gateway.jump.net.uk, ntp1.jump.net.uk, vrrp1.jump.net.uk) with customer machines named on their own domains — small UK businesses, news servers and other service operators.
• Transit for downstream networks. It originates 85.119.80.0/21, which is registered to BitFolk Limited, the London VPS provider (*.bitfolk.com), on BitFolk's own behalf. That is a customer's provider-independent space, not Jump's.

Notable

• Heavily peered for its size: roughly 12,500 IPv4 addresses but around a hundred BGP neighbours, reflecting an open peering policy at the London exchanges. Address count is a poor proxy for the importance of a network like this.
• Both kinds of space sit under the same AS, so individual prefixes must be attributed to their registrant rather than blanket-assigned to Jump.

Interesting

• Among its prefixes is 203.11.114.0/24, APNIC space whose rDNS reads gw.uk.apana.au and mail.uk.apana.org.au — the UK presence of APANA, the Australian Public Access Network Association, an early volunteer-run network. A fragment of 1990s community networking still routed out of a London datacentre.