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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.

Unannounced blocks in United States

26,302 blocks match, ordered by prefix.

Allocated but unannounced blocks, 16201 to 16250 of 26302
PrefixAddressesRegistryCountryAllocated
204.238.45.0/24256ARINUS8th Mar 1995
204.238.47.0/24256ARINUS8th Mar 1995
204.238.48.0/24256ARINUS8th Mar 1995
204.238.51.0/24256ARINUS10th Mar 1995
204.238.53.0/24256ARINUS21st Apr 1995
204.238.56.0/24256ARINUS21st Apr 1995
204.238.57.0/24256ARINUS24th Apr 1995
204.238.59.0/24256ARINUS24th Apr 1995
204.238.60.0/24256ARINUS25th Apr 1995
204.238.61.0/24256ARINUS25th Apr 1995
204.238.62.0/24256ARINUS25th Apr 1995
204.238.63.0/24256ARINUS25th Apr 1995
204.238.64.0/24256ARINUS25th Apr 1995
204.238.67.0/24256ARINUS25th Apr 1995
204.238.7.0/24256ARINUS20th Mar 1995
204.238.71.0/24256ARINUS26th Apr 1995
204.238.73.0/24256ARINUS26th Apr 1995
204.238.74.0/24256ARINUS27th Apr 1995
204.238.75.0/24256ARINUS27th Apr 1995
204.238.77.0/24256ARINUS27th Apr 1995
204.238.78.0/24256ARINUS27th Apr 1995
204.238.79.0/24256ARINUS27th Apr 1995
204.238.80.0/24256ARINUS28th Apr 1995
204.238.81.0/24256ARINUS28th Apr 1995
204.238.83.0/24256ARINUS28th Apr 1995
204.238.84.0/24256ARINUS28th Apr 1995
204.238.85.0/24256ARINUS28th Apr 1995
204.238.86.0/24256ARINUS1st May 1995
204.238.87.0/24256ARINUS1st May 1995
204.238.88.0/24256ARINUS1st May 1995
204.238.89.0/24256ARINUS1st May 1995
204.238.9.0/24256ARINUS9th Feb 1995
204.238.90.0/24256ARINUS1st May 1995
204.238.91.0/24256ARINUS1st May 1995
204.238.92.0/24256ARINUS1st May 1995
204.238.93.0/24256ARINUS1st May 1995
204.238.94.0/24256ARINUS1st May 1995
204.238.96.0/24256ARINUS1st May 1995
204.238.97.0/24256ARINUS1st May 1995
204.238.99.0/24256ARINUS1st May 1995
204.239.204.0/23512ARINUS27th Oct 2025
204.26.192.0/198.2kARINUS23rd May 1994
204.26.240.0/212kARINUS23rd May 1994
204.26.248.0/221kARINUS23rd May 1994
204.26.252.0/23512ARINUS23rd May 1994
204.26.254.0/24256ARINUS23rd May 1994
204.26.255.0/24256ARINUS31st May 2011
204.27.0.0/204.1kARINUS13th May 1994
204.27.130.0/24256ARINUS9th Nov 1994
204.27.131.0/24256ARINUS9th Nov 1994