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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 ARIN, largest first.
Unannounced blocks in Canada
3,775 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.139.208.0/24 | 256 | ARIN |  CA | 10th Aug 1992 |
| 192.139.209.0/24 | 256 | ARIN | CA | 10th Aug 1992 |
| 192.139.210.0/24 | 256 | ARIN | CA | 10th Aug 1992 |
| 192.139.211.0/24 | 256 | ARIN | CA | 10th Aug 1992 |
| 192.139.212.0/24 | 256 | ARIN | CA | 10th Aug 1992 |
| 192.139.218.0/24 | 256 | ARIN | CA | 18th Aug 1992 |
| 192.139.22.0/24 | 256 | ARIN | CA | 19th Feb 1992 |
| 192.139.225.0/24 | 256 | ARIN | CA | 31st Aug 1992 |
| 192.139.226.0/24 | 256 | ARIN | CA | 31st Aug 1992 |
| 192.139.227.0/24 | 256 | ARIN | CA | 31st Aug 1992 |
| 192.139.228.0/24 | 256 | ARIN | CA | 2nd Sept 1992 |
| 192.139.229.0/24 | 256 | ARIN | CA | 2nd Sept 1992 |
| 192.139.23.0/24 | 256 | ARIN | CA | 18th Feb 1992 |
| 192.139.230.0/24 | 256 | ARIN | CA | 2nd Sept 1992 |
| 192.139.232.0/24 | 256 | ARIN | CA | 1st Oct 1992 |
| 192.139.234.0/24 | 256 | ARIN | CA | 1st Oct 1992 |
| 192.139.235.0/24 | 256 | ARIN | CA | 1st Oct 1992 |
| 192.139.236.0/24 | 256 | ARIN | CA | 1st Oct 1992 |
| 192.139.238.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.239.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.24.0/24 | 256 | ARIN | CA | 19th Feb 1992 |
| 192.139.240.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.241.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.242.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.243.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.244.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.246.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.247.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.248.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.249.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.25.0/24 | 256 | ARIN | CA | 23rd Jun 1993 |
| 192.139.250.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.251.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.252.0/24 | 256 | ARIN | CA | 26th Oct 1992 |
| 192.139.253.0/24 | 256 | ARIN | CA | 24th May 1993 |
| 192.139.254.0/24 | 256 | ARIN | CA | 26th Oct 1992 |
| 192.139.28.0/24 | 256 | ARIN | CA | 26th Feb 1992 |
| 192.139.31.0/24 | 256 | ARIN | CA | 26th Feb 1992 |
| 192.139.32.0/24 | 256 | ARIN | CA | 26th Feb 1992 |
| 192.139.37.0/24 | 256 | ARIN | CA | 3rd Oct 2024 |
| 192.139.4.0/24 | 256 | ARIN | CA | 24th Jan 1992 |
| 192.139.42.0/24 | 256 | ARIN | CA | 1st Dec 1995 |
| 192.139.43.0/24 | 256 | ARIN | CA | 17th May 1994 |
| 192.139.44.0/24 | 256 | ARIN | CA | 3rd Mar 1992 |
| 192.139.45.0/24 | 256 | ARIN | CA | 10th Mar 1992 |
| 192.139.63.0/24 | 256 | ARIN | CA | 19th Mar 1992 |
| 192.139.64.0/24 | 256 | ARIN | CA | 19th Mar 1992 |
| 192.139.65.0/24 | 256 | ARIN | CA | 19th Mar 1992 |
| 192.139.66.0/24 | 256 | ARIN | CA | 19th Mar 1992 |
| 192.139.67.0/24 | 256 | ARIN | CA | 19th Mar 1992 |