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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,310 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 200.33.23.0/24 | 256 | LACNIC |  MX | 30th Apr 1996 |
| 200.33.236.0/23 | 512 | LACNIC | MX | 15th Aug 1996 |
| 200.33.238.0/23 | 512 | LACNIC | MX | 20th Dec 1997 |
| 200.33.24.0/24 | 256 | LACNIC | MX | 26th Dec 1997 |
| 200.33.248.0/24 | 256 | LACNIC | MX | 26th Aug 1996 |
| 200.33.250.0/24 | 256 | LACNIC | MX | 26th Aug 1996 |
| 200.33.251.0/24 | 256 | LACNIC | MX | 26th Aug 1996 |
| 200.33.254.0/24 | 256 | LACNIC | MX | 28th Aug 1996 |
| 200.33.255.0/24 | 256 | LACNIC | MX | 29th Apr 1999 |
| 200.33.29.0/24 | 256 | LACNIC | MX | 2nd Jun 1996 |
| 200.33.32.0/24 | 256 | LACNIC | MX | 4th Jun 1996 |
| 200.33.33.0/24 | 256 | LACNIC | MX | 4th Jun 1996 |
| 200.33.34.0/24 | 256 | LACNIC | MX | 11th Jun 1996 |
| 200.33.35.0/24 | 256 | LACNIC | MX | 15th Jun 1996 |
| 200.33.36.0/24 | 256 | LACNIC | MX | 1st Jul 1996 |
| 200.33.37.0/24 | 256 | LACNIC | MX | 1st Jul 1996 |
| 200.33.38.0/24 | 256 | LACNIC | MX | 30th Jun 1996 |
| 200.33.39.0/24 | 256 | LACNIC | MX | 30th Jun 1996 |
| 200.33.41.0/24 | 256 | LACNIC | MX | 30th Jun 1996 |
| 200.33.43.0/24 | 256 | LACNIC | MX | 7th Jul 1996 |
| 200.33.44.0/24 | 256 | LACNIC | MX | 7th Jul 1996 |
| 200.33.45.0/24 | 256 | LACNIC | MX | 7th Jul 1996 |
| 200.33.46.0/24 | 256 | LACNIC | MX | 9th Jul 1996 |
| 200.33.47.0/24 | 256 | LACNIC | MX | 9th Jul 1996 |
| 200.33.49.0/24 | 256 | LACNIC | MX | 11th Jul 1996 |
| 200.33.5.0/24 | 256 | LACNIC | MX | 19th Jun 1996 |
| 200.33.50.0/24 | 256 | LACNIC | MX | 11th Jul 1996 |
| 200.33.52.0/24 | 256 | LACNIC | MX | 17th Jul 1996 |
| 200.33.53.0/24 | 256 | LACNIC | MX | 17th Jul 1996 |
| 200.33.54.0/24 | 256 | LACNIC | MX | 17th Jul 1996 |
| 200.33.55.0/24 | 256 | LACNIC | MX | 17th Jul 1996 |
| 200.33.56.0/24 | 256 | LACNIC | MX | 11th Jun 2011 |
| 200.33.57.0/24 | 256 | LACNIC | MX | 11th Jun 2011 |
| 200.33.58.0/24 | 256 | LACNIC | MX | 19th Jul 1996 |
| 200.33.59.0/24 | 256 | LACNIC | MX | 23rd Jul 1996 |
| 200.33.62.0/23 | 512 | LACNIC | MX | 8th Aug 1996 |
| 200.33.64.0/24 | 256 | LACNIC | MX | 21st Jul 1996 |
| 200.33.65.0/24 | 256 | LACNIC | MX | 23rd Jul 1996 |
| 200.33.66.0/24 | 256 | LACNIC | MX | 23rd Jul 1996 |
| 200.33.68.0/24 | 256 | LACNIC | MX | 25th Jul 1996 |
| 200.33.69.0/24 | 256 | LACNIC | MX | 25th Jul 1996 |
| 200.33.70.0/23 | 512 | LACNIC | MX | 13th Aug 1996 |
| 200.33.73.0/24 | 256 | LACNIC | MX | 28th Jul 1996 |
| 200.33.75.0/24 | 256 | LACNIC | MX | 5th Aug 1996 |
| 200.33.76.0/24 | 256 | LACNIC | MX | 19th Aug 1996 |
| 200.33.77.0/24 | 256 | LACNIC | MX | 26th Dec 1997 |
| 200.33.78.0/24 | 256 | LACNIC | MX | 26th Dec 1997 |
| 200.34.129.0/24 | 256 | LACNIC | MX | 16th Oct 1996 |
| 200.34.130.0/24 | 256 | LACNIC | MX | 18th Oct 1996 |
| 200.34.131.0/24 | 256 | LACNIC | MX | 30th Oct 1996 |