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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 APNIC, largest first.
Unannounced blocks registered through APNIC
22,580 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 183.181.130.0/23 | 512 | APNIC |  JP | 1st Dec 2009 |
| 183.181.132.0/23 | 512 | APNIC | JP | 1st Dec 2009 |
| 183.181.138.0/23 | 512 | APNIC | JP | 1st Dec 2009 |
| 183.181.140.0/23 | 512 | APNIC | JP | 1st Dec 2009 |
| 183.183.0.0/16 | 65.5k | APNIC | JP | 7th Dec 2009 |
| 183.78.160.0/22 | 1k | APNIC |  CN | 19th Nov 2015 |
| 183.78.164.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 183.87.0.0/21 | 2k | APNIC |  IN | 13th Nov 2009 |
| 183.87.16.0/20 | 4.1k | APNIC | IN | 13th Nov 2009 |
| 183.87.196.0/22 | 1k | APNIC | IN | 13th Nov 2009 |
| 183.87.8.0/22 | 1k | APNIC | IN | 13th Nov 2009 |
| 183.91.128.0/22 | 1k | APNIC | CN | 25th Nov 2009 |
| 183.91.136.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 185.100.40.0/22 | 1k | APNIC |  BN | 13th May 2015 |
| 185.129.140.0/22 | 1k | APNIC |  LA | 2nd Dec 2015 |
| 185.251.172.0/22 | 1k | APNIC |  PH | 23rd Mar 2018 |
| 185.8.100.0/22 | 1k | APNIC | BN | 30th Oct 2012 |
| 187.126.64.0/20 | 4.1k | APNIC |  HK | 13th Mar 2025 |
| 187.42.128.0/18 | 16.4k | APNIC |  SG | 20th Feb 2025 |
| 187.53.192.0/20 | 4.1k | APNIC | HK | 13th Mar 2025 |
| 187.53.80.0/20 | 4.1k | APNIC | HK | 13th Mar 2025 |
| 187.55.112.0/20 | 4.1k | APNIC | HK | 13th Mar 2025 |
| 189.10.48.0/20 | 4.1k | APNIC | HK | 13th Mar 2025 |
| 189.75.0.0/20 | 4.1k | APNIC | HK | 13th Mar 2025 |
| 189.75.144.0/20 | 4.1k | APNIC | HK | 13th Mar 2025 |
| 191.43.0.0/16 | 65.5k | APNIC | SG | 20th Feb 2025 |
| 192.100.2.0/24 | 256 | APNIC |  KR | 11th Mar 1991 |
| 192.101.134.0/24 | 256 | APNIC |  AU | 27th Jun 1991 |
| 192.101.16.0/24 | 256 | APNIC |  NZ | 16th Apr 1991 |
| 192.102.204.0/22 | 1k | APNIC | CN | 11th Apr 1991 |
| 192.104.172.0/24 | 256 | APNIC | JP | 11th Jun 1991 |
| 192.104.247.0/24 | 256 | APNIC | JP | 17th Jun 1991 |
| 192.107.10.0/24 | 256 | APNIC | NZ | 10th Jan 2011 |
| 192.108.230.0/24 | 256 | APNIC |  TH | 2nd Aug 1991 |
| 192.111.102.0/24 | 256 | APNIC | NZ | 13th Jun 1991 |
| 192.111.32.0/24 | 256 | APNIC | AU | 4th Jun 1991 |
| 192.124.10.0/23 | 512 | APNIC | AU | 12th Sept 1991 |
| 192.124.117.0/24 | 256 | APNIC | AU | 23rd Sept 1991 |
| 192.124.12.0/23 | 512 | APNIC | AU | 12th Sept 1991 |
| 192.124.14.0/24 | 256 | APNIC | AU | 12th Sept 1991 |
| 192.124.154.0/24 | 256 | APNIC | CN | 23rd Sept 1991 |
| 192.131.27.0/24 | 256 | APNIC | AU | 9th Jan 2001 |
| 192.131.28.0/23 | 512 | APNIC | AU | 9th Jan 2001 |
| 192.131.30.0/24 | 256 | APNIC | AU | 9th Jan 2001 |
| 192.132.248.0/22 | 1k | APNIC | KR | 26th Nov 1991 |
| 192.132.253.0/24 | 256 | APNIC | AU | 20th Nov 1991 |
| 192.133.10.0/24 | 256 | APNIC | TH | 11th Feb 2011 |
| 192.133.14.0/24 | 256 | APNIC |  ID | 14th Aug 2026 |
| 192.133.66.0/24 | 256 | APNIC | PH | 16th Aug 2026 |
| 192.135.101.0/24 | 256 | APNIC | JP | 7th May 1993 |