SUBNET.IM

Allocated but unannounced space

Every block here was allocated or assigned by a regional internet registry, and none of them appeared in any routing table we collected at our last snapshot — neither as a route of their own, nor covered by a larger announcement, nor carved up into more specifics.

“Unannounced” does not mean “unused”

Plenty of allocated space is deliberately kept off the public internet: private interconnects, lab and lawful-intercept ranges, networks reachable only inside one operator, and space held in reserve. Some of it is announced somewhere our collectors cannot see, which is a limit of our vantage points rather than a fact about the block.

It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today. Nothing on this page means a block is unallocated, available, or free to announce.

Browse by registry

Browse by country

Countries with the most unannounced blocks, largest first.

Unannounced blocks in Japan

1,446 blocks match, ordered by prefix.

Allocated but unannounced blocks, 51 to 100 of 1446
PrefixAddressesRegistryCountryAllocated
103.2.124.0/221kAPNICJP21st Apr 2011
103.2.16.0/221kAPNICJP20th Apr 2011
103.2.40.0/221kAPNICJP20th Apr 2011
103.2.56.0/24256APNICJP20th Apr 2011
103.2.72.0/221kAPNICJP20th Apr 2011
103.204.230.0/24256APNICJP22nd Dec 2015
103.204.56.0/221kAPNICJP8th Dec 2015
103.207.20.0/221kAPNICJP22nd Jan 2016
103.207.216.0/221kAPNICJP29th Jan 2016
103.209.148.0/221kAPNICJP19th Feb 2016
103.209.236.0/221kAPNICJP23rd Feb 2016
103.21.104.0/221kAPNICJP9th Oct 2012
103.21.36.0/221kAPNICJP2nd Oct 2012
103.212.188.0/221kAPNICJP31st Mar 2016
103.214.152.0/221kAPNICJP13th Apr 2016
103.214.72.0/221kAPNICJP11th Apr 2016
103.215.252.0/221kAPNICJP27th Apr 2016
103.224.143.0/24256APNICJP21st Jan 2014
103.227.160.0/221kAPNICJP13th Mar 2014
103.235.180.0/24256APNICJP7th Jul 2023
103.238.244.0/221kAPNICJP29th Jul 2014
103.24.194.0/23512APNICJP22nd Apr 2013
103.241.152.0/221kAPNICJP3rd Sept 2013
103.242.252.0/221kAPNICJP30th Sept 2013
103.243.120.0/221kAPNICJP11th Oct 2013
103.243.208.0/221kAPNICJP17th Oct 2013
103.245.224.0/24256APNICJP24th Jan 2013
103.246.232.0/24256APNICJP31st Aug 2011
103.246.66.0/23512APNICJP2nd Aug 2023
103.246.72.0/23512APNICJP2nd Aug 2023
103.248.251.0/24256APNICJP30th May 2013
103.250.200.0/221kAPNICJP22nd Jul 2013
103.253.84.0/23512APNICJP14th Nov 2013
103.27.136.0/221kAPNICJP3rd Jul 2013
103.27.220.0/221kAPNICJP9th Jul 2013
103.27.40.0/221kAPNICJP1st Jul 2013
103.28.228.0/221kAPNICJP11th Jan 2012
103.29.113.0/24256APNICJP29th Jun 2011
103.3.180.0/221kAPNICJP3rd May 2011
103.3.8.0/221kAPNICJP27th Apr 2011
103.30.240.0/221kAPNICJP15th Nov 2012
103.31.252.0/221kAPNICJP3rd Dec 2012
103.35.60.0/221kAPNICJP11th Aug 2015
103.39.113.0/24256APNICJP24th Sept 2014
103.40.216.0/221kAPNICJP9th Oct 2014
103.42.44.0/221kAPNICJP30th Oct 2014
103.48.120.0/221kAPNICJP21st Jan 2015
103.51.180.0/221kAPNICJP27th Feb 2015
103.52.20.0/221kAPNICJP4th Mar 2015
103.52.232.0/221kAPNICJP17th Mar 2015