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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 205.210.41.0/24 | 256 | ARIN |  CA | 8th Apr 1995 |
| 205.210.44.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.45.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.46.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.47.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.48.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.49.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.5.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.50.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.51.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.54.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.55.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.56.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.57.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.58.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.59.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.60.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.61.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.62.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.63.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.71.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.72.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.73.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.74.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.78.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.79.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.8.0/21 | 2k | ARIN | CA | 8th Apr 1995 |
| 205.210.80.0/22 | 1k | ARIN | CA | 8th Apr 1995 |
| 205.210.84.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.210.96.0/21 | 2k | ARIN | CA | 8th Apr 1995 |
| 205.211.1.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.211.129.0/24 | 256 | ARIN | CA | 8th Nov 1995 |
| 205.211.138.0/23 | 512 | ARIN | CA | 24th Oct 1995 |
| 205.211.14.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.211.146.0/24 | 256 | ARIN | CA | 15th Nov 1995 |
| 205.211.147.0/24 | 256 | ARIN | CA | 17th Nov 1995 |
| 205.211.149.0/24 | 256 | ARIN | CA | 6th Dec 1995 |
| 205.211.15.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.211.150.0/23 | 512 | ARIN | CA | 4th Jan 1996 |
| 205.211.161.0/24 | 256 | ARIN | CA | 16th Jan 1996 |
| 205.211.170.0/24 | 256 | ARIN | CA | 13th Feb 1996 |
| 205.211.171.0/24 | 256 | ARIN | CA | 2nd Apr 1996 |
| 205.211.172.0/24 | 256 | ARIN | CA | 22nd Feb 1996 |
| 205.211.173.0/24 | 256 | ARIN | CA | 29th Feb 1996 |
| 205.211.174.0/24 | 256 | ARIN | CA | 29th Feb 1996 |
| 205.211.175.0/24 | 256 | ARIN | CA | 7th Mar 1996 |
| 205.211.176.0/23 | 512 | ARIN | CA | 4th Mar 1996 |
| 205.211.179.0/24 | 256 | ARIN | CA | 12th Mar 1996 |
| 205.211.3.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.211.79.0/24 | 256 | ARIN | CA | 29th Aug 1995 |