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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,310 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.60.159.0/24 | 256 | ARIN |  CA | 23rd Nov 1993 |
| 199.60.192.0/20 | 4.1k | ARIN | CA | 3rd Jan 1994 |
| 199.60.208.0/23 | 512 | ARIN | CA | 26th Apr 1994 |
| 199.60.210.0/23 | 512 | ARIN | CA | 12th May 1994 |
| 199.60.213.0/24 | 256 | ARIN | CA | 9th Jun 1994 |
| 199.60.214.0/24 | 256 | ARIN | CA | 9th Jun 1994 |
| 199.60.216.0/23 | 512 | ARIN | CA | 23rd Jan 1996 |
| 199.60.223.0/24 | 256 | ARIN | CA | 23rd Nov 1993 |
| 199.60.224.0/24 | 256 | ARIN | CA | 23rd Nov 1993 |
| 199.60.233.0/24 | 256 | ARIN | CA | 23rd Nov 1993 |
| 199.60.234.0/23 | 512 | ARIN | CA | 23rd Nov 1993 |
| 199.60.236.0/24 | 256 | ARIN | CA | 23rd Nov 1993 |
| 199.60.238.0/24 | 256 | ARIN | CA | 23rd Nov 1993 |
| 199.60.240.0/21 | 2k | ARIN | CA | 15th Dec 1993 |
| 199.60.248.0/23 | 512 | ARIN | CA | 23rd Nov 1993 |
| 199.60.250.0/24 | 256 | ARIN | CA | 23rd Nov 1993 |
| 199.60.251.0/24 | 256 | ARIN | CA | 23rd Nov 1993 |
| 199.60.253.0/24 | 256 | ARIN | CA | 23rd Nov 1993 |
| 199.60.254.0/24 | 256 | ARIN | CA | 23rd Nov 1993 |
| 199.60.26.0/23 | 512 | ARIN | CA | 7th Jan 1994 |
| 199.60.29.0/24 | 256 | ARIN | CA | 18th Jan 1994 |
| 199.60.49.0/24 | 256 | ARIN | CA | 2nd Feb 1994 |
| 199.60.50.0/23 | 512 | ARIN | CA | 9th Feb 1994 |
| 199.60.52.0/22 | 1k | ARIN | CA | 25th Jan 1994 |
| 199.60.56.0/22 | 1k | ARIN | CA | 9th Feb 1994 |
| 199.60.60.0/24 | 256 | ARIN | CA | 8th Feb 1994 |
| 199.60.61.0/24 | 256 | ARIN | CA | 8th Feb 1994 |
| 199.60.62.0/24 | 256 | ARIN | CA | 9th Mar 1994 |
| 199.60.64.0/19 | 8.2k | ARIN | CA | 16th May 1994 |
| 199.60.98.0/24 | 256 | ARIN | CA | 23rd Nov 1993 |
| 199.60.99.0/24 | 256 | ARIN | CA | 29th Mar 1994 |
| 199.65.192.0/21 | 2k | APNIC |  SG | 23rd Nov 1993 |
| 199.66.108.0/22 | 1k | ARIN |  US | 30th Sept 2025 |
| 199.66.112.0/22 | 1k | ARIN | US | 3rd Jan 2012 |
| 199.66.16.0/21 | 2k | ARIN | US | 26th Nov 1993 |
| 199.66.219.0/24 | 256 | ARIN | CA | 12th Sept 2024 |
| 199.66.228.0/22 | 1k | ARIN | US | 27th Dec 2010 |
| 199.66.236.0/22 | 1k | ARIN | US | 27th Dec 2010 |
| 199.66.24.0/22 | 1k | ARIN | US | 26th Nov 1993 |
| 199.66.248.0/22 | 1k | ARIN | US | 29th Dec 2010 |
| 199.66.28.0/23 | 512 | ARIN | US | 26th Nov 1993 |
| 199.66.32.0/20 | 4.1k | ARIN | US | 1st Dec 1993 |
| 199.66.48.0/22 | 1k | ARIN | US | 1st Dec 1993 |
| 199.66.52.0/22 | 1k | ARIN | US | 6th Oct 1994 |
| 199.66.56.0/21 | 2k | ARIN | US | 6th Oct 1994 |
| 199.66.80.0/22 | 1k | ARIN | US | 27th Dec 2011 |
| 199.67.240.0/21 | 2k | ARIN | US | 20th Jan 1994 |
| 199.67.8.0/21 | 2k | ARIN | US | 1st Dec 1993 |
| 199.68.0.0/22 | 1k | ARIN | US | 19th May 1994 |
| 199.68.100.0/23 | 512 | ARIN | US | 1st Dec 1993 |