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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

27,034 blocks match, ordered by prefix.

Allocated but unannounced blocks, 15151 to 15200 of 27034
PrefixAddressesRegistryCountryAllocated
199.91.88.0/221kARINUS30th Jan 2012
199.96.12.0/221kARINUS16th Mar 2009
199.96.156.0/221kARINUS16th Feb 2011
199.96.160.0/221kARINUS16th Feb 2011
199.96.172.0/221kARINUS18th Feb 2011
20.128.0.0/1665.5kARINUS18th Oct 2017
20.130.0.0/1665.5kARINUS18th Oct 2017
20.144.0.0/14262kARINUS18th Oct 2017
20.176.0.0/14262kARINUS18th Oct 2017
20.180.0.0/14262kARINUS22nd Feb 2017
20.32.0.0/1665.5kARINUS4th Sept 1989
200.0.94.0/24256ARINUS10th Feb 1994
200.10.155.0/24256ARINUS28th Apr 1994
200.10.160.0/24256ARINUS5th May 1994
200.102.176.0/204.1kRIPE NCCUS13th Mar 2025
200.110.232.0/212kARINUS28th Jul 2022
200.16.88.0/24256ARINUS31st Mar 1995
200.163.80.0/204.1kRIPE NCCUS13th Mar 2025
200.169.176.0/204.1kRIPE NCCUS13th Mar 2025
200.181.80.0/204.1kRIPE NCCUS13th Mar 2025
200.203.0.0/204.1kRIPE NCCUS13th Mar 2025
200.234.64.0/1816.4kARINUS20th Feb 2025
200.240.0.0/198.2kRIPE NCCUS17th Nov 1999
2001:1510::/324.3B × /64RIPE NCCUS23rd Jul 2003
2001:1818::/324.3B × /64ARINUS20th Jun 2003
2001:1840::/324.3B × /64ARINUS27th Jun 2003
2001:1888::/324.3B × /64ARINUS15th Oct 2003
2001:18a0::/324.3B × /64ARINUS27th Oct 2003
2001:1910::/324.3B × /64ARINUS8th Jan 2004
2001:1950::/324.3B × /64ARINUS13th Apr 2004
2001:1958::/324.3B × /64ARINUS20th Apr 2004
2001:19a0::/324.3B × /64ARINUS13th Jul 2004
2001:19c8::/324.3B × /64ARINUS13th Sept 2004
2001:19e0::/324.3B × /64ARINUS11th Oct 2004
2001:3540::/2934.4B × /64RIPE NCCUS12th Sept 2024
2001:38c0::/324.3B × /64RIPE NCCUS17th Sept 2024
2001:408::/324.3B × /64ARINUS2nd Feb 2010
2001:4808::/324.3B × /64ARINUS15th Dec 2004
2001:48a0::/324.3B × /64ARINUS25th Apr 2005
2001:48b8::/324.3B × /64ARINUS13th May 2005
2001:490::/324.3B × /64ARINUS11th Jul 2001
2001:4918::/324.3B × /64ARINUS14th Jul 2005
2001:4920::/324.3B × /64ARINUS21st Jul 2005
2001:4960::/324.3B × /64ARINUS3rd Oct 2005
2001:4980::/324.3B × /64ARINUS25th Oct 2005
2001:4990::/324.3B × /64ARINUS26th Oct 2005
2001:49a0::/324.3B × /64ARINUS27th Oct 2005
2001:49a8::/324.3B × /64ARINUS27th Oct 2005
2001:49c0::/324.3B × /64ARINUS2nd Nov 2005
2001:49d8::/324.3B × /64ARINUS22nd Nov 2005