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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

30,434 blocks match, ordered by prefix.

Allocated but unannounced blocks, 3051 to 3100 of 30434
PrefixAddressesRegistryCountryAllocated
171.204.0.0/15131kARINUS1st Feb 1995
171.206.0.0/1665.5kARINUS1st Feb 1995
172.102.0.0/221kARINVG11th Mar 2019
172.102.128.0/204.1kARINUS22nd Jun 2015
172.106.0.0/15131kARINUS6th Dec 2023
172.110.128.0/24256ARINUS16th Apr 2021
172.110.130.0/24256ARINUS5th Apr 2021
172.110.131.0/24256ARINUS30th Apr 2021
172.110.184.0/24256ARINUS2nd Apr 2021
172.110.48.0/221kARINUS24th Jun 2015
172.110.52.0/221kARINUS24th Jun 2015
172.111.0.0/221kARINUS8th Jul 2021
172.111.25.0/24256ARINUS13th Jul 2021
172.111.40.0/221kARINUS7th Jul 2021
172.111.55.0/24256ARINUS19th Jul 2021
172.255.212.0/221kARINUS13th Mar 2013
172.255.216.0/212kARINUS13th Mar 2013
172.72.0.0/14262kARINUS6th Apr 2015
172.81.40.0/221kARINUS1st Apr 2021
172.82.105.0/24256ARINUS8th Apr 2021
172.82.107.0/24256ARINUS1st Jul 2025
172.82.16.0/221kARINUS7th Apr 2021
172.82.21.0/24256ARINUS8th Apr 2021
172.82.34.0/24256ARINUS6th Apr 2021
172.82.40.0/221kARINCA9th Apr 2021
172.82.56.0/221kARINUS6th Apr 2021
172.82.69.0/24256ARINUS2nd Jun 2021
172.82.92.0/221kARINUS8th Apr 2021
172.83.1.0/24256ARINUS13th Jan 2018
172.83.124.0/24256ARINUS12th Feb 2018
172.83.125.0/24256ARINUS29th Jan 2018
172.83.146.0/24256ARINUS19th Jan 2018
172.83.200.0/24256ARINUS18th Jan 2018
172.83.203.0/24256ARINUS5th Feb 2018
172.83.207.0/24256ARINUS7th Apr 2020
172.83.250.0/24256ARINUS3rd Apr 2025
172.83.51.0/24256ARINUS17th Jan 2018
172.83.56.0/221kARINCA18th Jan 2018
172.84.129.0/24256ARINUS6th Mar 2018
172.84.146.0/23512ARINUS13th Feb 2018
172.84.154.0/24256ARINUS14th Mar 2018
172.84.156.0/24256ARINUS22nd Feb 2018
172.84.159.0/24256ARINUS17th Jan 2018
172.85.64.0/212kARINUS20th May 2015
172.85.88.0/212kARINUS21st May 2015
172.86.160.0/204.1kARINUS1st Jun 2015
172.87.231.0/24256ARINUS1st Jul 2025
172.87.240.0/204.1kARINUS29th Nov 2017
172.93.80.0/204.1kARINCA25th Jun 2015
172.96.130.0/23512ARINUS1st May 2018