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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks
85,493 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.8.23.0/24 | 256 | APNIC |  CN | 14th Apr 2011 |
| 203.8.4.0/22 | 1k | APNIC |  AU | 31st Aug 1994 |
| 203.8.68.0/24 | 256 | APNIC | AU | 9th Sept 1994 |
| 203.8.70.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.8.8.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.8.82.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.8.86.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.8.91.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.8.96.0/21 | 2k | APNIC |  GB | 15th Sept 1994 |
| 203.80.129.0/24 | 256 | APNIC | CN | 9th Jun 2016 |
| 203.80.132.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.80.169.0/24 | 256 | APNIC |  TW | 27th Jun 2019 |
| 203.80.32.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 203.80.4.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.81.103.0/24 | 256 | APNIC |  LK | 11th Nov 2002 |
| 203.81.16.0/20 | 4.1k | APNIC | CN | 8th Jan 2002 |
| 203.81.192.0/20 | 4.1k | RIPE NCC |  US | 10th Jul 2001 |
| 203.81.244.0/22 | 1k | APNIC | CN | 11th Nov 2015 |
| 203.81.32.0/23 | 512 | APNIC |  SG | 1st Feb 2001 |
| 203.81.35.0/24 | 256 | APNIC | SG | 1st Feb 2001 |
| 203.81.38.0/23 | 512 | APNIC | SG | 1st Feb 2001 |
| 203.81.96.0/23 | 512 | APNIC | LK | 11th Nov 2002 |
| 203.81.98.0/24 | 256 | APNIC | LK | 11th Nov 2002 |
| 203.82.112.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.82.116.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.82.120.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.82.124.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.82.216.0/23 | 512 | APNIC | AU | 23rd Jan 2008 |
| 203.82.218.0/24 | 256 | APNIC |  BD | 9th Jan 2018 |
| 203.82.224.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.82.228.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.82.232.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.82.236.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.82.248.0/23 | 512 | APNIC |  IN | 17th Jan 2007 |
| 203.82.4.0/22 | 1k | APNIC | IN | 17th Jan 2007 |
| 203.83.0.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.83.12.0/22 | 1k | APNIC | CN | 12th Nov 2015 |
| 203.83.24.0/23 | 512 | APNIC |  ID | 18th Jan 2006 |
| 203.83.250.0/24 | 256 | APNIC | SG | 30th Jan 2007 |
| 203.83.251.0/24 | 256 | APNIC |  FJ | 8th Feb 2007 |
| 203.83.30.0/23 | 512 | APNIC | ID | 18th Jan 2006 |
| 203.84.0.0/18 | 16.4k | APNIC |  HK | 21st Mar 1996 |
| 203.84.130.0/23 | 512 | APNIC | SG | 28th Oct 2005 |
| 203.84.132.0/24 | 256 | APNIC | AU | 12th Feb 2007 |
| 203.84.144.0/21 | 2k | APNIC | TW | 20th Jan 2006 |
| 203.84.64.0/19 | 8.2k | APNIC | AU | 4th Feb 2004 |
| 203.86.250.0/24 | 256 | APNIC | CN | 9th Jun 2016 |
| 203.89.133.0/24 | 256 | APNIC | CN | 9th Jun 2016 |
| 203.89.136.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.89.140.0/22 | 1k | APNIC |  VN | 15th Apr 2009 |