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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 200.11.36.0/24 | 256 | LACNIC |  PE | 21st Mar 1995 |
| 200.11.37.0/24 | 256 | LACNIC | PE | 29th Mar 1995 |
| 200.11.38.0/23 | 512 | LACNIC | PE | 29th Mar 1995 |
| 200.110.224.0/21 | 2k | LACNIC |  AR | 27th Oct 2006 |
| 200.110.232.0/21 | 2k | ARIN |  US | 28th Jul 2022 |
| 200.110.240.0/20 | 4.1k | LACNIC | AR | 19th Oct 2006 |
| 200.112.224.0/24 | 256 | LACNIC |  CL | 12th Jan 2004 |
| 200.115.182.0/23 | 512 | LACNIC |  HT | 19th Jul 2012 |
| 200.115.186.0/23 | 512 | LACNIC | AR | 17th Oct 2012 |
| 200.12.128.0/24 | 256 | LACNIC |  MX | 19th May 1994 |
| 200.12.129.0/24 | 256 | LACNIC | CL | 22nd Jul 1994 |
| 200.12.132.0/24 | 256 | LACNIC | CL | 29th Jul 1994 |
| 200.12.139.0/24 | 256 | LACNIC |  BR | 18th Feb 2016 |
| 200.12.142.0/24 | 256 | LACNIC | CL | 17th Aug 1994 |
| 200.12.143.0/24 | 256 | LACNIC | CL | 19th Aug 1994 |
| 200.12.144.0/23 | 512 | LACNIC | CL | 22nd Aug 1994 |
| 200.12.147.0/24 | 256 | LACNIC | CL | 22nd Aug 1994 |
| 200.12.148.0/22 | 1k | LACNIC | CL | 22nd Aug 1994 |
| 200.12.152.0/24 | 256 | LACNIC | CL | 22nd Aug 1994 |
| 200.12.155.0/24 | 256 | LACNIC |  UY | 29th Aug 1994 |
| 200.12.156.0/24 | 256 | LACNIC | UY | 29th Aug 1994 |
| 200.12.164.0/24 | 256 | LACNIC | MX | 16th Oct 2008 |
| 200.12.165.0/24 | 256 | LACNIC | MX | 7th Sept 1994 |
| 200.12.167.0/24 | 256 | LACNIC |  CR | 20th Sept 1994 |
| 200.12.170.0/24 | 256 | LACNIC |  CO | 17th Feb 1995 |
| 200.12.172.0/23 | 512 | LACNIC |  SV | 28th Feb 1995 |
| 200.12.174.0/24 | 256 | LACNIC | SV | 28th Feb 1995 |
| 200.12.175.0/24 | 256 | LACNIC | CO | 28th Feb 1995 |
| 200.12.193.0/24 | 256 | LACNIC |  VE | 21st Mar 1995 |
| 200.123.43.0/24 | 256 | LACNIC | CL | 7th Apr 2011 |
| 200.123.44.0/24 | 256 | LACNIC | CL | 7th Apr 2011 |
| 200.124.120.0/24 | 256 | LACNIC |  PY | 15th Nov 2011 |
| 200.126.49.0/24 | 256 | LACNIC | CL | 10th Jul 2014 |
| 200.128.192.0/19 | 8.2k | LACNIC | BR | 15th Feb 2000 |
| 200.128.224.0/20 | 4.1k | LACNIC | BR | 15th Feb 2000 |
| 200.13.128.0/22 | 1k | LACNIC | MX | 27th Sept 1994 |
| 200.13.33.0/24 | 256 | LACNIC | MX | 19th Oct 1994 |
| 200.13.35.0/24 | 256 | LACNIC | MX | 15th Nov 1994 |
| 200.13.36.0/24 | 256 | LACNIC | MX | 16th Nov 1994 |
| 200.13.37.0/24 | 256 | LACNIC | MX | 30th Nov 1994 |
| 200.13.64.0/20 | 4.1k | LACNIC | MX | 31st Oct 1994 |
| 200.13.80.0/23 | 512 | LACNIC | MX | 28th Feb 1995 |
| 200.13.82.0/24 | 256 | LACNIC | MX | 28th Feb 1995 |
| 200.13.83.0/24 | 256 | LACNIC | AR | 9th Nov 2010 |
| 200.138.16.0/20 | 4.1k | RIPE NCC |  AE | 13th Mar 2025 |
| 200.138.32.0/20 | 4.1k | RIPE NCC | AE | 13th Mar 2025 |
| 200.14.0.0/21 | 2k | LACNIC | CL | 8th Nov 1993 |
| 200.14.100.0/22 | 1k | LACNIC | CL | 3rd Feb 1995 |
| 200.14.110.0/24 | 256 | LACNIC | CL | 17th Feb 1995 |
| 200.14.117.0/24 | 256 | LACNIC | CL | 21st Mar 1995 |