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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 APNIC, largest first.
Unannounced blocks registered through APNIC
22,595 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.231.127.0/24 | 256 | APNIC |  AU | 6th Oct 1992 |
| 192.231.136.0/24 | 256 | APNIC | AU | 8th Oct 1992 |
| 192.231.168.0/24 | 256 | APNIC | AU | 13th Oct 1992 |
| 192.231.183.0/24 | 256 | APNIC |  NZ | 8th Feb 2011 |
| 192.231.212.0/24 | 256 | APNIC | AU | 20th Oct 1992 |
| 192.232.34.0/23 | 512 | APNIC |  CN | 4th Jan 2026 |
| 192.232.38.0/23 | 512 | APNIC |  ID | 5th Jan 2026 |
| 192.232.44.0/23 | 512 | APNIC | CN | 6th Jan 2026 |
| 192.232.46.0/23 | 512 | APNIC | CN | 6th Jan 2026 |
| 192.245.106.0/23 | 512 | APNIC | AU | 2nd Nov 1992 |
| 192.245.11.0/24 | 256 | APNIC | ID | 27th Jan 2026 |
| 192.245.220.0/24 | 256 | APNIC | NZ | 24th Jan 2011 |
| 192.245.58.0/23 | 512 | APNIC |  SG | 30th Oct 1992 |
| 192.251.148.0/24 | 256 | APNIC | AU | 11th Feb 2011 |
| 192.251.227.0/24 | 256 | APNIC |  TH | 10th Jan 2011 |
| 192.251.228.0/24 | 256 | APNIC | TH | 11th Feb 2011 |
| 192.251.229.0/24 | 256 | APNIC | ID | 18th Aug 2026 |
| 192.26.216.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.217.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.218.0/23 | 512 | APNIC | AU | 17th May 1990 |
| 192.26.220.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.221.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.222.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.223.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.224.0/23 | 512 | APNIC | AU | 17th May 1990 |
| 192.26.226.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.227.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.228.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.229.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.96.0/24 | 256 | APNIC |  JP | 26th Feb 1987 |
| 192.31.116.0/22 | 1k | APNIC | JP | 8th Jul 1987 |
| 192.31.120.0/24 | 256 | APNIC | JP | 8th Jul 1987 |
| 192.31.122.0/23 | 512 | APNIC | JP | 8th Jul 1987 |
| 192.31.124.0/24 | 256 | APNIC | JP | 8th Jul 1987 |
| 192.31.197.0/24 | 256 | APNIC | JP | 28th Aug 1987 |
| 192.35.248.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.40.0.0/22 | 1k | APNIC |  KR | 29th Nov 2012 |
| 192.41.178.0/23 | 512 | APNIC | JP | 20th Jun 1988 |
| 192.41.180.0/22 | 1k | APNIC | JP | 20th Jun 1988 |
| 192.41.184.0/21 | 2k | APNIC | JP | 20th Jun 1988 |
| 192.41.193.0/24 | 256 | APNIC | JP | 20th Jun 1988 |
| 192.41.194.0/23 | 512 | APNIC | JP | 20th Jun 1988 |
| 192.41.196.0/23 | 512 | APNIC | JP | 20th Jun 1988 |
| 192.41.206.0/24 | 256 | APNIC | ID | 24th Jun 1988 |
| 192.42.103.0/24 | 256 | APNIC | JP | 21st Sept 1988 |
| 192.42.104.0/22 | 1k | APNIC | JP | 21st Sept 1988 |
| 192.43.189.0/24 | 256 | APNIC | JP | 11th Feb 2011 |
| 192.43.208.0/24 | 256 | APNIC | AU | 5th Dec 1988 |
| 192.43.229.0/24 | 256 | APNIC | AU | 16th Dec 1988 |
| 192.47.0.0/24 | 256 | APNIC | JP | 12th Jan 1989 |