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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 200.9.204.0/24 | 256 | LACNIC |  CL | 27th Dec 1993 |
| 200.9.205.0/24 | 256 | LACNIC | CL | 29th Dec 1993 |
| 200.9.208.0/24 | 256 | LACNIC |  AR | 30th Dec 1993 |
| 200.9.209.0/24 | 256 | LACNIC |  CR | 6th Jan 1994 |
| 200.9.210.0/24 | 256 | LACNIC | CR | 6th Jan 1994 |
| 200.9.211.0/24 | 256 | LACNIC | CR | 6th Jan 1994 |
| 200.9.215.0/24 | 256 | LACNIC | CL | 21st Jan 1994 |
| 200.9.216.0/23 | 512 | LACNIC |  TT | 21st Jan 1994 |
| 200.9.218.0/24 | 256 | LACNIC | TT | 21st Jan 1994 |
| 200.9.219.0/24 | 256 | LACNIC | AR | 22nd Jan 1994 |
| 200.9.225.0/24 | 256 | LACNIC | CL | 26th Jan 1994 |
| 200.9.228.0/24 | 256 | LACNIC | CL | 9th Feb 1994 |
| 200.9.230.0/23 | 512 | LACNIC | CL | 21st Feb 1994 |
| 200.9.232.0/23 | 512 | LACNIC | CL | 21st Feb 1994 |
| 200.9.236.0/24 | 256 | LACNIC | AR | 22nd Feb 1994 |
| 200.9.238.0/23 | 512 | LACNIC | CL | 21st Feb 1994 |
| 200.9.240.0/23 | 512 | LACNIC | CL | 21st Feb 1994 |
| 200.9.246.0/24 | 256 | LACNIC | AR | 23rd Feb 1994 |
| 200.9.247.0/24 | 256 | LACNIC | CL | 23rd Feb 1994 |
| 200.9.248.0/24 | 256 | LACNIC |  EC | 23rd Feb 1994 |
| 200.9.250.0/23 | 512 | LACNIC | CL | 22nd Dec 2015 |
| 200.9.253.0/24 | 256 | LACNIC | AR | 25th Feb 1994 |
| 200.9.254.0/24 | 256 | LACNIC | AR | 25th Feb 1994 |
| 200.9.64.0/24 | 256 | LACNIC | CL | 27th Mar 1993 |
| 200.9.66.0/24 | 256 | LACNIC |  BR | 7th Apr 1993 |
| 200.9.74.0/24 | 256 | LACNIC |  GT | 13th May 1993 |
| 200.9.79.0/24 | 256 | LACNIC | CL | 1st Jun 1993 |
| 200.9.8.0/21 | 2k | LACNIC |  MX | 19th May 1993 |
| 200.9.80.0/24 | 256 | LACNIC | CL | 1st Jun 1993 |
| 200.9.81.0/24 | 256 | LACNIC | CL | 17th Jun 1993 |
| 200.90.156.0/22 | 1k | LACNIC | MX | 5th Dec 2008 |
| 200.93.247.0/24 | 256 | LACNIC |  UY | 2nd Jul 2014 |
| 200.94.178.0/24 | 256 | LACNIC | MX | 3rd Aug 2007 |
| 200.94.179.0/24 | 256 | LACNIC | MX | 3rd Aug 2007 |
| 200.94.184.0/21 | 2k | LACNIC | MX | 11th Jun 2011 |
| 200.97.32.0/20 | 4.1k | APNIC |  HK | 13th Mar 2025 |
| 2001:1200::/32 | 4.3B × /64 | LACNIC | MX | 10th Jan 2003 |
| 2001:1202::/32 | 4.3B × /64 | LACNIC | MX | 11th Mar 2024 |
| 2001:1220::/32 | 4.3B × /64 | LACNIC | MX | 7th Oct 2005 |
| 2001:1221::/48 | 65.5k × /64 | LACNIC | MX | 18th Jun 2014 |
| 2001:1224::/32 | 4.3B × /64 | LACNIC | MX | 11th Mar 2025 |
| 2001:1228::/32 | 4.3B × /64 | LACNIC | MX | 15th Nov 2005 |
| 2001:122b::/32 | 4.3B × /64 | LACNIC | MX | 8th Jul 2025 |
| 2001:122c::/32 | 4.3B × /64 | LACNIC | MX | 28th Dec 2009 |
| 2001:122d::/32 | 4.3B × /64 | LACNIC | MX | 10th Sept 2025 |
| 2001:122e::/32 | 4.3B × /64 | LACNIC | MX | 25th Jul 2025 |
| 2001:1240::/32 | 4.3B × /64 | LACNIC | MX | 28th Oct 2010 |
| 2001:1261::/32 | 4.3B × /64 | LACNIC | MX | 7th Aug 2025 |
| 2001:1264::/32 | 4.3B × /64 | LACNIC | MX | 19th Sept 2025 |
| 2001:126a::/32 | 4.3B × /64 | LACNIC | MX | 4th Dec 2025 |