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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 200.23.95.0/24 | 256 | LACNIC |  MX | 31st Jan 1996 |
| 200.234.64.0/18 | 16.4k | ARIN |  US | 20th Feb 2025 |
| 200.234.8.0/21 | 2k | LACNIC |  BR | 16th Oct 2003 |
| 200.24.8.0/24 | 256 | LACNIC |  CO | 21st Mar 1995 |
| 200.24.9.0/24 | 256 | LACNIC | CO | 21st Mar 1995 |
| 200.240.0.0/19 | 8.2k | RIPE NCC | US | 17th Nov 1999 |
| 200.3.114.0/24 | 256 | LACNIC | BR | 11th Jun 2026 |
| 200.3.115.0/24 | 256 | LACNIC |  AR | 5th Dec 1995 |
| 200.3.128.0/20 | 4.1k | LACNIC | CO | 4th May 1995 |
| 200.3.147.0/24 | 256 | LACNIC | CO | 22nd Jul 2009 |
| 200.3.156.0/22 | 1k | LACNIC | CO | 18th Jul 1995 |
| 200.3.224.0/20 | 4.1k | LACNIC |  HN | 4th May 1995 |
| 200.3.240.0/24 | 256 | LACNIC | HN | 7th Jun 1995 |
| 200.3.8.0/23 | 512 | LACNIC |  VE | 22nd Jun 1994 |
| 200.33.1.0/24 | 256 | LACNIC | MX | 29th Mar 2004 |
| 200.33.106.0/24 | 256 | LACNIC | MX | 26th Mar 1996 |
| 200.33.107.0/24 | 256 | LACNIC | MX | 26th Mar 1996 |
| 200.33.108.0/24 | 256 | LACNIC |  CR | 2nd Jul 2025 |
| 200.33.110.0/24 | 256 | LACNIC | MX | 11th Jun 2011 |
| 200.33.118.0/24 | 256 | LACNIC | MX | 9th May 1996 |
| 200.33.120.0/24 | 256 | LACNIC | MX | 9th May 1996 |
| 200.33.121.0/24 | 256 | LACNIC | MX | 9th May 1996 |
| 200.33.122.0/24 | 256 | LACNIC | MX | 12th May 1996 |
| 200.33.123.0/24 | 256 | LACNIC | MX | 12th May 1996 |
| 200.33.124.0/24 | 256 | LACNIC | MX | 12th May 1996 |
| 200.33.14.0/24 | 256 | LACNIC | MX | 1st Apr 1996 |
| 200.33.15.0/24 | 256 | LACNIC | MX | 26th Mar 1996 |
| 200.33.16.0/24 | 256 | LACNIC | MX | 26th Mar 1996 |
| 200.33.168.0/24 | 256 | LACNIC | MX | 21st May 1996 |
| 200.33.169.0/24 | 256 | LACNIC | MX | 31st Jan 2002 |
| 200.33.17.0/24 | 256 | LACNIC | MX | 1st Apr 1996 |
| 200.33.170.0/24 | 256 | LACNIC | MX | 26th Dec 1997 |
| 200.33.172.0/24 | 256 | LACNIC | MX | 4th Jun 1996 |
| 200.33.173.0/24 | 256 | LACNIC | MX | 7th Aug 1996 |
| 200.33.176.0/24 | 256 | LACNIC | MX | 9th Aug 1996 |
| 200.33.177.0/24 | 256 | LACNIC | MX | 13th Aug 1996 |
| 200.33.179.0/24 | 256 | LACNIC | MX | 13th Aug 1996 |
| 200.33.180.0/24 | 256 | LACNIC | MX | 20th Aug 1996 |
| 200.33.181.0/24 | 256 | LACNIC | MX | 15th Aug 1996 |
| 200.33.183.0/24 | 256 | LACNIC | MX | 18th Aug 1996 |
| 200.33.184.0/24 | 256 | LACNIC | MX | 18th Aug 1996 |
| 200.33.185.0/24 | 256 | LACNIC | MX | 20th Aug 1996 |
| 200.33.187.0/24 | 256 | LACNIC | MX | 8th May 1997 |
| 200.33.19.0/24 | 256 | LACNIC | MX | 26th Dec 1997 |
| 200.33.2.0/24 | 256 | LACNIC | MX | 16th Jun 1997 |
| 200.33.204.0/24 | 256 | LACNIC | MX | 18th Aug 1996 |
| 200.33.205.0/24 | 256 | LACNIC | MX | 18th Aug 1996 |
| 200.33.207.0/24 | 256 | LACNIC | MX | 22nd Aug 1996 |
| 200.33.21.0/24 | 256 | LACNIC | MX | 22nd Apr 1996 |
| 200.33.22.0/24 | 256 | LACNIC | MX | 24th Apr 1996 |