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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 200.0.124.0/24 | 256 | LACNIC |  CL | 5th Jan 1995 |
| 200.0.125.0/24 | 256 | LACNIC |  MX | 5th Jan 1995 |
| 200.0.126.0/23 | 512 | LACNIC | MX | 5th Jan 1995 |
| 200.0.133.0/24 | 256 | LACNIC | MX | 24th Jan 1995 |
| 200.0.136.0/24 | 256 | LACNIC |  PE | 15th Mar 1995 |
| 200.0.139.0/24 | 256 | LACNIC |  VE | 3rd Apr 1995 |
| 200.0.140.0/23 | 512 | LACNIC | CL | 3rd Apr 1995 |
| 200.0.142.0/24 | 256 | LACNIC | PE | 3rd Apr 1995 |
| 200.0.143.0/24 | 256 | LACNIC | MX | 4th Apr 1995 |
| 200.0.146.0/24 | 256 | LACNIC | CL | 4th Apr 1995 |
| 200.0.147.0/24 | 256 | LACNIC | CL | 20th Apr 1995 |
| 200.0.148.0/23 | 512 | LACNIC | CL | 11th Dec 2000 |
| 200.0.150.0/23 | 512 | LACNIC | CL | 20th Apr 1995 |
| 200.0.152.0/24 | 256 | LACNIC | CL | 25th Apr 1995 |
| 200.0.153.0/24 | 256 | LACNIC | CL | 25th Apr 1995 |
| 200.0.154.0/24 | 256 | LACNIC | CL | 28th Apr 1995 |
| 200.0.155.0/24 | 256 | LACNIC | CL | 28th Apr 1995 |
| 200.0.157.0/24 | 256 | LACNIC | CL | 28th Apr 1995 |
| 200.0.159.0/24 | 256 | LACNIC | CL | 28th Apr 1995 |
| 200.0.164.0/24 | 256 | LACNIC | PE | 4th Apr 1995 |
| 200.0.165.0/24 | 256 | LACNIC | PE | 4th Apr 1995 |
| 200.0.168.0/24 | 256 | LACNIC | PE | 20th Apr 1995 |
| 200.0.169.0/24 | 256 | LACNIC | PE | 28th Apr 1995 |
| 200.0.17.0/24 | 256 | LACNIC |  AR | 9th Nov 2010 |
| 200.0.170.0/23 | 512 | LACNIC | PE | 25th Apr 1995 |
| 200.0.172.0/23 | 512 | LACNIC | PE | 25th Apr 1995 |
| 200.0.18.0/24 | 256 | LACNIC |  HT | 29th Apr 2009 |
| 200.0.181.0/24 | 256 | LACNIC | AR | 20th Apr 1995 |
| 200.0.186.0/24 | 256 | LACNIC | AR | 17th Jul 1995 |
| 200.0.19.0/24 | 256 | LACNIC | AR | 9th Nov 2010 |
| 200.0.198.0/23 | 512 | LACNIC | AR | 8th Sept 1995 |
| 200.0.200.0/24 | 256 | LACNIC | AR | 31st Oct 1995 |
| 200.0.22.0/23 | 512 | LACNIC |  SX | 3rd Jun 2008 |
| 200.0.71.0/24 | 256 | LACNIC |  BR | 18th Jun 2014 |
| 200.0.75.0/24 | 256 | LACNIC |  EC | 5th Mar 1993 |
| 200.0.76.0/24 | 256 | LACNIC | EC | 5th Mar 1993 |
| 200.0.77.0/24 | 256 | LACNIC | EC | 5th Mar 1993 |
| 200.0.78.0/24 | 256 | LACNIC | EC | 5th Mar 1993 |
| 200.0.79.0/24 | 256 | LACNIC | AR | 31st Mar 1993 |
| 200.0.80.0/24 | 256 | LACNIC | AR | 31st Mar 1993 |
| 200.0.82.0/24 | 256 | LACNIC | CL | 5th May 1993 |
| 200.0.83.0/24 | 256 | LACNIC | MX | 18th May 1993 |
| 200.0.84.0/24 | 256 | LACNIC | MX | 3rd Jun 1993 |
| 200.0.86.0/23 | 512 | LACNIC |  UY | 22nd Oct 2014 |
| 200.0.94.0/24 | 256 | ARIN |  US | 10th Feb 1994 |
| 200.0.95.0/24 | 256 | LACNIC | MX | 18th Feb 1994 |
| 200.0.96.0/22 | 1k | LACNIC | MX | 16th Apr 2026 |
| 200.1.0.0/22 | 1k | LACNIC | VE | 13th May 1993 |
| 200.1.130.0/24 | 256 | LACNIC | CL | 4th May 1995 |
| 200.1.132.0/22 | 1k | LACNIC | CL | 27th Apr 1995 |