Hi, From public routing data we can see a total of 2,419 /25s prefixes announced from at least one of the monitors active in RIPE RIS and RouteViews. None of the /25s are actually advertised by all these monitors i.e. the /25s reach some but not all the ASes which take part in these projects. The actual distribution of how many unique routing tables sampled contain the /25s is the following: http://visibility.it.uc3m.es/len25_distro.html (out of the approx. 140 collectors that have a "full" routing table). The top 5 ASes that are originating the most /25s are: AS 11427: 462 /25s AS 4766: 273 /25s AS 45400: 109 /25s AS 14065: 82 /25s AS 3549: 57 /25s If you are interested in limited visibility prefixes, i.e., prefixes that are distributed to some but not all the "full" routing tables at the interdomain level, you can find more at http://visibility.it.uc3m.es/ and https://labs.ripe.net/Members/andra_lutu/the-bgp-visibility-scanner Best regards, Andra On 06/22/2013 12:00 AM, nanog-request@nanog.org wrote:

Date: Fri, 21 Jun 2013 13:56:02 -0600 From: Michael McConnell<michael@winkstreaming.com> To: North American Network Operators Group<nanog@nanog.org> Subject: /25's prefixes announced into global routing table?

Hello all,

As the IPv4 space get smaller and smaller, does anyone think we'll see a time when /25's will be accepted for global BGP prefix announcement. The current smallest size is a /24 and generally ok for most people, but the crunch gets tighter, routers continue to have more and more ram will it always be /24 the smallest size?

Cheers, Mike