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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

1,447 blocks match, ordered by prefix.

Allocated but unannounced blocks, 751 to 800 of 1447
PrefixAddressesRegistryCountryAllocated
192.52.128.0/204.1kAPNICJP24th Jan 2011
192.52.144.0/221kAPNICJP24th Jan 2011
192.52.148.0/23512APNICJP24th Jan 2011
192.52.150.0/24256APNICJP24th Jan 2011
192.55.118.0/24256APNICJP31st Jul 1989
192.76.252.0/23512APNICJP3rd Feb 2011
194.117.52.128/2664RIPE NCCJP21st Aug 2025
198.56.20.0/23512APNICJP28th Jul 2025
198.74.24.0/23512APNICJP22nd Feb 1993
199.103.103.0/24256ARINJP25th Jun 1994
199.43.18.0/24256APNICJP18th Mar 1994
2001:2a0:2000::/35537M × /64APNICJP18th Nov 2002
2001:2a0:4000::/341.1B × /64APNICJP18th Nov 2002
2001:2a0:8000::/332.1B × /64APNICJP18th Nov 2002
2001:2a0::/35537M × /64APNICJP8th Dec 2000
2001:2c8:2000::/35537M × /64APNICJP13th Aug 2004
2001:2c8:4000::/341.1B × /64APNICJP13th Aug 2004
2001:2c8:8000::/332.1B × /64APNICJP13th Aug 2004
2001:2c8::/35537M × /64APNICJP8th Feb 2001
2001:368:2000::/35537M × /64APNICJP12th Jul 2002
2001:368:4000::/341.1B × /64APNICJP12th Jul 2002
2001:368:8000::/332.1B × /64APNICJP12th Jul 2002
2001:368::/35537M × /64APNICJP12th Dec 2001
2001:3d0:2000::/35537M × /64APNICJP14th Feb 2003
2001:3d0:4000::/341.1B × /64APNICJP14th Feb 2003
2001:3d0:8000::/332.1B × /64APNICJP14th Feb 2003
2001:3d0::/35537M × /64APNICJP21st May 2002
2001:3e8::/324.3B × /64APNICJP6th Aug 2010
2001:44b0::/324.3B × /64APNICJP7th Nov 2005
2001:7f8:164::/4865.5k × /64RIPE NCCJP21st Aug 2025
2001:7fa:0:3::/641 × /64APNICJP26th Feb 2002
2001:7fa:7::/4865.5k × /64APNICJP26th May 2005
2001:a000::/218.8T × /64APNICJP1st Dec 2004
2001:c40::/324.3B × /64APNICJP8th Aug 2002
2001:c70::/324.3B × /64APNICJP10th Sept 2002
2001:cb8::/324.3B × /64APNICJP11th Oct 2002
2001:cd0::/324.3B × /64APNICJP5th Dec 2002
2001:d90::/324.3B × /64APNICJP17th Oct 2003
2001:ddb::/4865.5k × /64APNICJP13th Jul 2022
2001:de8:1e::/4865.5k × /64APNICJP1st Nov 2012
2001:de8:2000::/4865.5k × /64APNICJP5th May 2026
2001:de8:8::/4865.5k × /64APNICJP11th Aug 2008
2001:de8:c::/4865.5k × /64APNICJP3rd Mar 2009
2001:df0:15::/4865.5k × /64APNICJP25th Jun 2008
2001:df0:21e::/4865.5k × /64APNICJP28th Apr 2011
2001:df0:254::/4865.5k × /64APNICJP13th Oct 2011
2001:df0:258::/4865.5k × /64APNICJP1st Nov 2011
2001:df0:293::/4865.5k × /64APNICJP1st Feb 2012
2001:df0:2a6::/4865.5k × /64APNICJP20th Mar 2012
2001:df0:2b4::/4865.5k × /64APNICJP9th May 2012