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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

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Countries with unannounced space registered through RIPE NCC, largest first.

Unannounced blocks in United States

559 blocks match, ordered by prefix.

Allocated but unannounced blocks, 1 to 50 of 559
PrefixAddressesRegistryCountryAllocated
13.168.0.0/13524kRIPE NCCUS25th Apr 1986
13.176.0.0/13524kRIPE NCCUS25th Apr 1986
130.195.198.0/24256RIPE NCCUS26th Sept 1988
130.78.176.0/24256RIPE NCCUS24th Jun 1988
130.78.179.0/24256RIPE NCCUS24th Jun 1988
130.78.180.0/221kRIPE NCCUS24th Jun 1988
131.222.144.0/204.1kRIPE NCCUS6th Apr 1990
135.132.160.0/204.1kRIPE NCCUS6th Jan 1994
135.132.32.0/204.1kRIPE NCCUS6th Jan 1994
136.242.128.0/1732.8kRIPE NCCUS5th Oct 1989
139.100.100.0/221kRIPE NCCUS15th Feb 1990
139.100.99.0/24256RIPE NCCUS15th Feb 1990
140.184.28.0/221kRIPE NCCUS16th May 1990
140.184.8.0/212kRIPE NCCUS16th May 1990
140.184.96.0/198.2kRIPE NCCUS16th May 1990
144.2.192.0/198.2kRIPE NCCUS1st Sept 1993
144.249.0.0/1732.8kRIPE NCCUS11th Jan 1991
146.19.181.0/24256RIPE NCCUS17th Nov 2021
146.19.252.0/24256RIPE NCCUS22nd Nov 2021
146.255.184.0/24256RIPE NCCUS30th Aug 2021
153.15.0.0/1665.5kRIPE NCCUS1st Sept 1993
158.120.79.0/24256RIPE NCCUS28th Feb 1992
158.178.0.0/1732.8kRIPE NCCUS24th Mar 1992
158.94.214.0/24256RIPE NCCUS20th Feb 1992
161.108.209.0/24256RIPE NCCUS25th Jun 1992
164.12.0.0/1665.5kRIPE NCCUS2nd Nov 1992
164.177.184.0/212kRIPE NCCUS21st Nov 2011
166.10.0.0/1665.5kRIPE NCCUS1st Sept 1993
166.11.0.0/1665.5kRIPE NCCUS1st Sept 1993
166.8.0.0/1665.5kRIPE NCCUS1st Sept 1993
166.9.0.0/1665.5kRIPE NCCUS1st Sept 1993
168.151.21.0/24256RIPE NCCUS4th Apr 1994
170.100.147.0/24256RIPE NCCUS24th Mar 1994
171.22.200.0/221kRIPE NCCUS1st Feb 2019
176.10.89.0/24256RIPE NCCUS23rd Jan 2025
176.117.111.0/24256RIPE NCCUS24th Jul 2025
176.126.97.0/24256RIPE NCCUS27th Jan 2026
178.249.104.0/212kRIPE NCCUS25th May 2010
178.255.244.0/221kRIPE NCCUS15th Jul 2010
178.79.192.0/1816.4kRIPE NCCUS12th May 2010
185.1.180.0/24256RIPE NCCUS6th Jul 2020
185.116.100.0/221kRIPE NCCUS8th Sept 2015
185.116.233.0/24256RIPE NCCUS10th Sept 2015
185.12.232.0/221kRIPE NCCUS11th Dec 2012
185.133.148.0/221kRIPE NCCUS5th Jan 2016
185.133.252.0/221kRIPE NCCUS11th Jan 2016
185.135.152.0/221kRIPE NCCUS22nd Jan 2016
185.138.192.0/221kRIPE NCCUS15th Feb 2016
185.142.4.0/221kRIPE NCCUS4th Mar 2016
185.147.152.0/221kRIPE NCCUS15th Apr 2016