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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,954 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 61.249.0.0/18 | 16.4k | APNIC |  KR | 21st Mar 2001 |
| 61.249.160.0/19 | 8.2k | APNIC | KR | 21st Mar 2001 |
| 61.249.192.0/19 | 8.2k | APNIC | KR | 21st Mar 2001 |
| 61.249.64.0/20 | 4.1k | APNIC | KR | 21st Mar 2001 |
| 61.249.80.0/21 | 2k | APNIC | KR | 21st Mar 2001 |
| 61.249.88.0/22 | 1k | APNIC | KR | 21st Mar 2001 |
| 61.251.128.0/19 | 8.2k | APNIC | KR | 21st Mar 2001 |
| 61.251.32.0/19 | 8.2k | APNIC | KR | 21st Mar 2001 |
| 61.251.80.0/20 | 4.1k | APNIC | KR | 21st Mar 2001 |
| 61.252.0.0/20 | 4.1k | APNIC | KR | 21st Mar 2001 |
| 61.252.64.0/22 | 1k | APNIC | KR | 21st Mar 2001 |
| 61.252.68.0/22 | 1k | APNIC | KR | 21st Mar 2001 |
| 61.252.72.0/22 | 1k | APNIC | KR | 21st Mar 2001 |
| 61.252.80.0/20 | 4.1k | APNIC | KR | 21st Mar 2001 |
| 61.28.0.0/20 | 4.1k | APNIC |  CN | 28th Mar 2001 |
| 61.29.192.0/19 | 8.2k | APNIC | CN | 10th Dec 2004 |
| 61.29.224.0/20 | 4.1k | APNIC | CN | 10th Dec 2004 |
| 61.4.176.0/20 | 4.1k | APNIC | CN | 29th Jan 2007 |
| 61.4.84.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 61.4.88.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 61.44.0.0/23 | 512 | APNIC |  JP | 28th Aug 2003 |
| 61.44.2.0/24 | 256 | APNIC | JP | 28th Aug 2003 |
| 61.44.3.0/24 | 256 | APNIC | JP | 28th Aug 2003 |
| 61.44.4.0/22 | 1k | APNIC | JP | 28th Aug 2003 |
| 61.44.67.0/24 | 256 | APNIC | JP | 26th Sept 2003 |
| 61.44.8.0/21 | 2k | APNIC | JP | 28th Aug 2003 |
| 61.45.128.0/18 | 16.4k | APNIC | CN | 31st Jan 2005 |
| 61.45.224.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 61.45.248.0/23 | 512 | APNIC |  AU | 27th Sept 2010 |
| 61.45.250.0/24 | 256 | APNIC | AU | 7th Apr 2010 |
| 61.45.251.0/24 | 256 | APNIC | AU | 7th Apr 2010 |
| 61.45.252.0/22 | 1k | APNIC | AU | 7th Apr 2010 |
| 61.47.0.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.102.0/23 | 512 | APNIC | JP | 1st Mar 2005 |
| 61.47.108.0/22 | 1k | APNIC | JP | 1st Mar 2005 |
| 61.47.15.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.17.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.21.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.22.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.24.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.27.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.29.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.3.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.4.0/23 | 512 | APNIC | JP | 1st Mar 2005 |
| 61.47.44.0/23 | 512 | APNIC | JP | 1st Mar 2005 |
| 61.47.46.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.49.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.50.0/23 | 512 | APNIC | JP | 1st Mar 2005 |
| 61.47.53.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.54.0/23 | 512 | APNIC | JP | 1st Mar 2005 |