AS14585 — CIFNET - CIFNet, Inc.

AS14585 announces 1 IPv4 prefixes covering 2,048 addresses and 1 IPv6 prefixes.

About this network

One IPv4 block and seventeen IPv6 announcements, sized in a doubling ladder.

What it's used for

• A provider's network. 2,048 addresses in a single IPv4 prefix, alongside seventeen IPv6 prefixes, with three observed BGP neighbours.

Notable

• The IPv6 announcements step through /48, /48, /47, /46, /45, /44, /43, /42 and /41, each twice the size of the one before, under a covering 2604:65c0::/40.
• 208.76.168.0/21 carries the netname CIFNET-US-1, with separate operations and abuse contacts.
• Three addresses were queried for reverse DNS and none returned a name.

Interesting

• That ladder is what you get when a range is described exactly rather than approximately. Any contiguous span of addresses can be written as a set of aligned blocks, and if the span does not begin and end on a power-of-two boundary the set comes out as a sequence of doubling sizes. Seeing it announced this way means the operator asked a tool to cover a range and announced whatever the tool produced.
• The cost is seventeen entries in every routing table on the internet where one or two would carry the same traffic. IPv6 was meant to end this practice by making allocations large enough that nobody needed to split them.
• The imbalance is striking on its own: one modest IPv4 block against a very large IPv6 allocation, which is the correct shape for a network built after the old addresses ran out.

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

Announced prefixes

• 208.76.168.0/21
• 2604:65c0::/32

Upstream networks

• AS6939 Hurricane Electric LLC
• AS3257 GTT Communications Inc.
• AS11878 tzulo, inc.

Adjacent networks

• AS6939 Hurricane Electric LLC
• AS3257 GTT Communications Inc.
• AS11878 tzulo, inc.

Routing security

• RPKI: 11 valid, 0 invalid and 0 not-found announcements; 2 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 13 route objects.
• Listed in as-sets: AS-CIFNET, AS-GTTCUST, AS-GTTCUST6, AS-HURRICANE, AS-HURRICANEV6, AS-SHARKTECH-CUSTOMERS, AS-TRANSROUTE-SPEC, AS-TZULO.