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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
Browse by registry
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,356 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 210.115.64.0/19 | 8.2k | APNIC |  KR | 30th Apr 1997 |
| 210.127.0.0/19 | 8.2k | APNIC | KR | 18th Jul 1996 |
| 210.14.160.0/19 | 8.2k | APNIC |  CN | 21st Jun 2001 |
| 210.14.32.0/20 | 4.1k | APNIC |  PH | 11th Feb 2002 |
| 210.15.128.0/18 | 16.4k | APNIC | CN | 3rd Aug 2001 |
| 210.16.76.0/22 | 1k | APNIC |  IN | 21st Jan 2016 |
| 210.17.160.0/24 | 256 | APNIC |  HK | 24th Jul 2002 |
| 210.17.161.0/24 | 256 | APNIC |  JP | 24th Jul 2002 |
| 210.17.223.0/24 | 256 | APNIC | HK | 7th Aug 2003 |
| 210.185.192.0/18 | 16.4k | APNIC | CN | 10th Dec 2004 |
| 210.2.16.0/20 | 4.1k | APNIC | CN | 20th Apr 2007 |
| 210.205.96.0/20 | 4.1k | APNIC | KR | 25th May 1999 |
| 210.211.32.0/20 | 4.1k | APNIC | JP | 5th Jul 2006 |
| 210.218.96.0/19 | 8.2k | APNIC | KR | 23rd Mar 1999 |
| 210.220.32.0/19 | 8.2k | APNIC | KR | 25th May 1999 |
| 210.221.160.0/19 | 8.2k | APNIC | KR | 25th May 1999 |
| 210.23.32.0/19 | 8.2k | APNIC | CN | 25th May 2006 |
| 210.23.64.0/20 | 4.1k | APNIC |  ID | 14th Jun 2002 |
| 210.24.132.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.134.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.141.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.143.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.144.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.147.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.148.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.151.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.152.0/22 | 1k | APNIC | JP | 16th Dec 1996 |
| 210.24.158.0/23 | 512 | APNIC | JP | 16th Dec 1996 |
| 210.24.16.0/21 | 2k | APNIC | JP | 16th Dec 1996 |
| 210.24.161.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.164.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.173.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.175.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.176.0/21 | 2k | APNIC | JP | 16th Dec 1996 |
| 210.24.184.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.186.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.188.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.191.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.193.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.194.0/23 | 512 | APNIC | JP | 16th Dec 1996 |
| 210.24.199.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.200.0/23 | 512 | APNIC | JP | 16th Dec 1996 |
| 210.24.204.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.206.0/23 | 512 | APNIC | JP | 16th Dec 1996 |
| 210.24.213.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.215.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.217.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.220.0/22 | 1k | APNIC | JP | 16th Dec 1996 |
| 210.24.225.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.227.0/24 | 256 | APNIC | JP | 16th Dec 1996 |