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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 200.1.136.0/22 | 1k | LACNIC |  CL | 27th Apr 1995 |
| 200.1.152.0/24 | 256 | LACNIC |  NI | 20th Jun 1995 |
| 200.1.153.0/24 | 256 | LACNIC |  GT | 11th Jul 1995 |
| 200.1.162.0/23 | 512 | LACNIC |  VE | 8th Sept 1995 |
| 200.1.164.0/22 | 1k | LACNIC | VE | 3rd Aug 1995 |
| 200.1.172.0/24 | 256 | LACNIC |  EC | 11th Sept 1995 |
| 200.1.184.0/21 | 2k | LACNIC | VE | 11th Aug 1995 |
| 200.1.192.0/21 | 2k | LACNIC |  CO | 10th Aug 1995 |
| 200.1.4.0/23 | 512 | LACNIC | VE | 13th May 1993 |
| 200.1.6.0/24 | 256 | LACNIC | EC | 21st Mar 2006 |
| 200.10.128.0/24 | 256 | LACNIC |  AR | 25th Feb 1994 |
| 200.10.129.0/24 | 256 | LACNIC | AR | 25th Feb 1994 |
| 200.10.136.0/23 | 512 | LACNIC | CO | 10th Mar 2016 |
| 200.10.139.0/24 | 256 | LACNIC | AR | 15th Mar 1994 |
| 200.10.142.0/24 | 256 | LACNIC |  DO | 24th Mar 1994 |
| 200.10.143.0/24 | 256 | LACNIC |  MX | 25th Mar 1994 |
| 200.10.145.0/24 | 256 | LACNIC |  CR | 4th Apr 1994 |
| 200.10.155.0/24 | 256 | ARIN |  US | 28th Apr 1994 |
| 200.10.160.0/24 | 256 | ARIN | US | 5th May 1994 |
| 200.10.162.0/24 | 256 | LACNIC | DO | 9th May 1994 |
| 200.10.165.0/24 | 256 | ARIN |  BM | 9th May 1994 |
| 200.10.183.0/24 | 256 | LACNIC |  BR | 18th Nov 2015 |
| 200.10.188.0/24 | 256 | LACNIC |  PE | 13th May 1994 |
| 200.10.190.0/24 | 256 | LACNIC | CL | 14th May 1994 |
| 200.10.194.0/24 | 256 | LACNIC |  BZ | 18th May 1994 |
| 200.10.195.0/24 | 256 | LACNIC | CL | 23rd May 1994 |
| 200.10.197.0/24 | 256 | LACNIC | MX | 23rd Aug 1994 |
| 200.10.198.0/24 | 256 | LACNIC | MX | 23rd Aug 1994 |
| 200.10.203.0/24 | 256 | LACNIC |  PA | 2nd Nov 1994 |
| 200.10.207.0/24 | 256 | LACNIC | AR | 25th May 1994 |
| 200.10.208.0/24 | 256 | LACNIC | CL | 26th May 1994 |
| 200.10.211.0/24 | 256 | LACNIC | CL | 31st May 1994 |
| 200.10.212.0/22 | 1k | LACNIC | MX | 2nd Jun 1994 |
| 200.10.216.0/23 | 512 | LACNIC | MX | 2nd Jun 1994 |
| 200.10.218.0/24 | 256 | LACNIC | MX | 2nd Jun 1994 |
| 200.10.219.0/24 | 256 | LACNIC | AR | 6th Jun 1994 |
| 200.10.232.0/24 | 256 | LACNIC | CL | 15th Jun 1994 |
| 200.10.238.0/24 | 256 | LACNIC | CL | 22nd Jun 1994 |
| 200.10.240.0/24 | 256 | LACNIC | MX | 23rd Jun 1994 |
| 200.10.241.0/24 | 256 | LACNIC | GT | 23rd Jun 1994 |
| 200.10.242.0/24 | 256 | LACNIC | CL | 28th Jun 1994 |
| 200.10.250.0/24 | 256 | LACNIC | PE | 7th Jul 1994 |
| 200.10.254.0/24 | 256 | LACNIC | VE | 12th Jul 1994 |
| 200.10.255.0/24 | 256 | LACNIC | CL | 20th Jul 1994 |
| 200.102.176.0/20 | 4.1k | RIPE NCC | US | 13th Mar 2025 |
| 200.106.152.0/21 | 2k | LACNIC | CL | 30th Mar 2009 |
| 200.106.246.0/24 | 256 | LACNIC |  HN | 16th Sept 2011 |
| 200.11.29.0/24 | 256 | LACNIC | AR | 7th Apr 2009 |
| 200.11.31.0/24 | 256 | LACNIC |  SV | 4th Aug 2009 |
| 200.11.32.0/24 | 256 | LACNIC | PE | 25th Oct 1994 |