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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks in Canada
3,819 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.71.153.0/24 | 256 | ARIN |  CA | 1st Dec 1993 |
| 199.71.155.0/24 | 256 | ARIN | CA | 1st Dec 1993 |
| 199.71.156.0/24 | 256 | ARIN | CA | 1st Dec 1993 |
| 199.71.157.0/24 | 256 | ARIN | CA | 1st Dec 1993 |
| 199.71.158.0/24 | 256 | ARIN | CA | 1st Dec 1993 |
| 199.71.16.0/20 | 4.1k | ARIN | CA | 14th Dec 1993 |
| 199.71.161.0/24 | 256 | ARIN | CA | 1st Dec 1993 |
| 199.71.162.0/23 | 512 | ARIN | CA | 11th Mar 1994 |
| 199.71.164.0/22 | 1k | ARIN | CA | 11th Mar 1994 |
| 199.71.189.0/24 | 256 | ARIN | CA | 25th Feb 1994 |
| 199.71.190.0/24 | 256 | ARIN | CA | 13th May 1994 |
| 199.71.191.0/24 | 256 | ARIN | CA | 10th Feb 1994 |
| 199.71.192.0/20 | 4.1k | ARIN | CA | 1st Feb 1994 |
| 199.71.208.0/24 | 256 | ARIN | CA | 8th Feb 1994 |
| 199.71.248.0/22 | 1k | ARIN | CA | 22nd Mar 1994 |
| 199.71.253.0/24 | 256 | ARIN | CA | 12th May 1994 |
| 199.71.254.0/24 | 256 | ARIN | CA | 12th May 1994 |
| 199.71.3.0/24 | 256 | ARIN | CA | 18th Jan 1994 |
| 199.71.32.0/20 | 4.1k | ARIN | CA | 3rd Jan 1994 |
| 199.71.48.0/22 | 1k | ARIN | CA | 3rd Jan 1994 |
| 199.71.69.0/24 | 256 | ARIN | CA | 1st Apr 1994 |
| 199.71.71.0/24 | 256 | ARIN | CA | 25th Mar 1994 |
| 199.71.72.0/21 | 2k | ARIN | CA | 1st Dec 1993 |
| 199.71.8.0/24 | 256 | ARIN | CA | 6th Apr 1994 |
| 199.71.84.0/24 | 256 | ARIN | CA | 25th Mar 1994 |
| 199.71.85.0/24 | 256 | ARIN | CA | 31st Mar 1994 |
| 199.71.86.0/24 | 256 | ARIN | CA | 23rd Mar 1994 |
| 199.71.87.0/24 | 256 | ARIN | CA | 24th Mar 1994 |
| 199.71.88.0/24 | 256 | ARIN | CA | 25th Mar 1994 |
| 199.71.89.0/24 | 256 | ARIN | CA | 25th Mar 1994 |
| 199.71.9.0/24 | 256 | ARIN | CA | 14th Apr 1994 |
| 199.71.90.0/24 | 256 | ARIN | CA | 25th Mar 1994 |
| 199.71.91.0/24 | 256 | ARIN | CA | 1st Dec 1993 |
| 199.71.92.0/24 | 256 | ARIN | CA | 1st Dec 1993 |
| 199.71.94.0/23 | 512 | ARIN | CA | 1st Dec 1993 |
| 199.71.96.0/21 | 2k | ARIN | CA | 15th Mar 1994 |
| 199.83.136.0/22 | 1k | ARIN | CA | 18th Jan 2011 |
| 199.84.1.0/24 | 256 | ARIN | CA | 3rd Jan 1994 |
| 199.84.135.0/24 | 256 | ARIN | CA | 23rd Jun 1994 |
| 199.84.145.0/24 | 256 | ARIN | CA | 8th Dec 1993 |
| 199.84.146.0/24 | 256 | ARIN | CA | 22nd Jun 1994 |
| 199.84.148.0/23 | 512 | ARIN | CA | 6th Jun 1994 |
| 199.84.150.0/23 | 512 | ARIN | CA | 26th Feb 1996 |
| 199.84.152.0/24 | 256 | ARIN | CA | 8th Dec 1993 |
| 199.84.153.0/24 | 256 | ARIN | CA | 23rd May 1994 |
| 199.84.154.0/24 | 256 | ARIN | CA | 17th May 1994 |
| 199.84.155.0/24 | 256 | ARIN | CA | 17th May 1994 |
| 199.84.156.0/24 | 256 | ARIN | CA | 17th May 1994 |
| 199.84.16.0/20 | 4.1k | ARIN | CA | 20th Dec 1993 |
| 199.84.160.0/23 | 512 | ARIN | CA | 1st Jun 1994 |