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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 200.23.165.0/24 | 256 | LACNIC |  MX | 2nd Oct 1996 |
| 200.23.167.0/24 | 256 | LACNIC | MX | 2nd Oct 1996 |
| 200.23.172.0/24 | 256 | LACNIC | MX | 2nd Oct 1996 |
| 200.23.173.0/24 | 256 | LACNIC | MX | 27th Sept 1996 |
| 200.23.174.0/24 | 256 | LACNIC | MX | 15th Oct 1996 |
| 200.23.175.0/24 | 256 | LACNIC | MX | 29th Oct 1996 |
| 200.23.177.0/24 | 256 | LACNIC | MX | 29th Sept 1996 |
| 200.23.178.0/24 | 256 | LACNIC | MX | 2nd Oct 1996 |
| 200.23.185.0/24 | 256 | LACNIC | MX | 11th Jun 2011 |
| 200.23.190.0/23 | 512 | LACNIC | MX | 7th Oct 1996 |
| 200.23.192.0/22 | 1k | LACNIC | MX | 30th Apr 1996 |
| 200.23.196.0/23 | 512 | LACNIC | MX | 30th Apr 1996 |
| 200.23.198.0/23 | 512 | LACNIC | MX | 6th Feb 1996 |
| 200.23.2.0/24 | 256 | LACNIC | MX | 4th Feb 1995 |
| 200.23.20.0/24 | 256 | LACNIC | MX | 26th Dec 1997 |
| 200.23.203.0/24 | 256 | LACNIC | MX | 11th Jun 2011 |
| 200.23.204.0/24 | 256 | LACNIC | MX | 31st Jan 1996 |
| 200.23.206.0/24 | 256 | LACNIC |  CL | 19th Aug 2016 |
| 200.23.208.0/24 | 256 | LACNIC | MX | 11th Jul 1996 |
| 200.23.209.0/24 | 256 | LACNIC | MX | 11th Jul 1996 |
| 200.23.21.0/24 | 256 | LACNIC | MX | 26th Dec 1997 |
| 200.23.210.0/23 | 512 | LACNIC | MX | 19th Dec 1995 |
| 200.23.255.0/24 | 256 | LACNIC |  BR | 22nd Aug 2016 |
| 200.23.3.0/24 | 256 | LACNIC | MX | 1st Feb 1995 |
| 200.23.33.0/24 | 256 | LACNIC | MX | 22nd Apr 1996 |
| 200.23.4.0/24 | 256 | LACNIC | MX | 2nd Feb 1995 |
| 200.23.44.0/23 | 512 | LACNIC | MX | 1st Jun 1995 |
| 200.23.46.0/24 | 256 | LACNIC | MX | 5th Jun 1995 |
| 200.23.47.0/24 | 256 | LACNIC | MX | 15th Jun 1995 |
| 200.23.48.0/24 | 256 | LACNIC | MX | 15th Jun 1995 |
| 200.23.49.0/24 | 256 | LACNIC | MX | 15th Jun 1995 |
| 200.23.50.0/24 | 256 | LACNIC | MX | 15th Jun 1995 |
| 200.23.54.0/24 | 256 | LACNIC | MX | 19th Dec 1995 |
| 200.23.55.0/24 | 256 | LACNIC | MX | 15th Jun 1995 |
| 200.23.56.0/24 | 256 | LACNIC | MX | 15th Jun 1995 |
| 200.23.58.0/24 | 256 | LACNIC | MX | 15th Jun 1995 |
| 200.23.60.0/24 | 256 | LACNIC | MX | 20th Sept 2000 |
| 200.23.61.0/24 | 256 | LACNIC | MX | 11th Jun 2011 |
| 200.23.62.0/24 | 256 | LACNIC | MX | 11th Jun 2011 |
| 200.23.63.0/24 | 256 | LACNIC | MX | 30th Aug 1999 |
| 200.23.66.0/24 | 256 | LACNIC | MX | 26th Dec 1997 |
| 200.23.67.0/24 | 256 | LACNIC | MX | 16th Jan 1996 |
| 200.23.74.0/24 | 256 | LACNIC | MX | 31st Jan 1996 |
| 200.23.82.0/24 | 256 | LACNIC | MX | 31st Jan 1996 |
| 200.23.83.0/24 | 256 | LACNIC | MX | 31st Jan 1996 |
| 200.23.86.0/24 | 256 | LACNIC | MX | 31st Jan 1996 |
| 200.23.87.0/24 | 256 | LACNIC | MX | 30th Jan 2002 |
| 200.23.88.0/24 | 256 | LACNIC | MX | 5th Feb 1996 |
| 200.23.89.0/24 | 256 | LACNIC | MX | 31st Jan 1996 |
| 200.23.94.0/24 | 256 | LACNIC | MX | 31st Jan 1996 |