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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

Unannounced blocks in United States

595 blocks match, ordered by prefix.

Allocated but unannounced blocks, 1 to 50 of 595
PrefixAddressesRegistryCountryAllocated
103.5.188.0/221kRIPE NCCUS28th Sept 2011
129.101.96.0/198.2kRIPE NCCUS13th Jun 1988
13.168.0.0/13524kRIPE NCCUS25th Apr 1986
13.176.0.0/13524kRIPE NCCUS25th Apr 1986
130.195.198.0/24256RIPE NCCUS26th Sept 1988
130.78.176.0/212kRIPE NCCUS24th Jun 1988
131.222.136.0/212kRIPE NCCUS6th Apr 1990
131.222.144.0/204.1kRIPE NCCUS6th Apr 1990
131.222.160.0/204.1kRIPE NCCUS6th Apr 1990
131.222.176.0/204.1kRIPE NCCUS6th Apr 1990
132.243.0.0/204.1kRIPE NCCUS29th Mar 1989
132.243.128.0/198.2kRIPE NCCUS29th Mar 1989
132.243.96.0/204.1kRIPE NCCUS29th Mar 1989
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
139.100.112.0/204.1kRIPE NCCUS15th Feb 1990
139.100.99.0/24256RIPE NCCUS15th Feb 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
150.251.16.0/204.1kRIPE NCCUS19th Aug 1991
150.251.192.0/204.1kRIPE NCCUS19th Aug 1991
151.123.192.0/198.2kRIPE NCCUS17th Jun 1991
151.185.0.0/198.2kRIPE NCCUS17th Sept 1991
152.234.192.0/1816.4kRIPE NCCUS6th Mar 2025
153.15.0.0/1665.5kRIPE NCCUS1st Sept 1993
153.79.128.0/198.2kRIPE NCCUS23rd Sept 1991
153.79.192.0/198.2kRIPE NCCUS23rd Sept 1991
157.70.0.0/1732.8kRIPE NCCUS2nd Oct 1992
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
161.104.112.0/204.1kRIPE NCCUS24th Jun 1992
161.104.128.0/198.2kRIPE NCCUS24th Jun 1992
161.108.209.0/24256RIPE NCCUS25th Jun 1992
163.120.128.0/1732.8kRIPE NCCUS20th Jul 1992
163.79.128.0/1732.8kRIPE NCCUS1st Apr 2005
164.12.0.0/1665.5kRIPE NCCUS2nd Nov 1992
164.177.184.0/212kRIPE NCCUS21st Nov 2011
165.217.64.0/221kRIPE NCCUS7th Sept 1993
165.217.68.0/221kRIPE NCCUS7th Sept 1993
165.217.72.0/221kRIPE NCCUS7th Sept 1993
165.217.76.0/221kRIPE NCCUS7th Sept 1993
165.217.80.0/221kRIPE NCCUS7th Sept 1993
165.217.84.0/221kRIPE NCCUS7th Sept 1993
165.217.88.0/221kRIPE NCCUS7th Sept 1993
165.217.92.0/221kRIPE NCCUS7th Sept 1993