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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in South Korea
511 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.39.36.0/22 | 1k | APNIC |  KR | 16th Sept 2014 |
| 103.4.148.0/22 | 1k | APNIC | KR | 8th Jul 2011 |
| 103.68.148.0/22 | 1k | APNIC | KR | 5th Jul 2016 |
| 103.68.152.0/22 | 1k | APNIC | KR | 5th Jul 2016 |
| 110.172.64.0/19 | 8.2k | APNIC | KR | 28th Apr 2009 |
| 110.232.100.0/22 | 1k | APNIC | KR | 19th May 2009 |
| 110.232.104.0/21 | 2k | APNIC | KR | 19th May 2009 |
| 110.34.56.0/21 | 2k | APNIC | KR | 3rd Mar 2009 |
| 110.4.108.0/22 | 1k | APNIC | KR | 23rd Feb 2009 |
| 110.4.112.0/20 | 4.1k | APNIC | KR | 23rd Feb 2009 |
| 110.4.64.0/20 | 4.1k | APNIC | KR | 23rd Feb 2009 |
| 110.4.80.0/21 | 2k | APNIC | KR | 23rd Feb 2009 |
| 110.4.92.0/22 | 1k | APNIC | KR | 23rd Feb 2009 |
| 110.4.96.0/21 | 2k | APNIC | KR | 23rd Feb 2009 |
| 110.76.140.0/22 | 1k | APNIC | KR | 12th Jan 2011 |
| 111.221.32.0/21 | 2k | APNIC | KR | 14th Jul 2009 |
| 111.67.224.0/19 | 8.2k | APNIC | KR | 5th Jun 2009 |
| 112.72.16.0/20 | 4.1k | APNIC | KR | 24th Dec 2008 |
| 112.72.32.0/19 | 8.2k | APNIC | KR | 24th Dec 2008 |
| 113.21.0.0/19 | 8.2k | APNIC | KR | 9th Oct 2008 |
| 113.30.112.0/20 | 4.1k | APNIC | KR | 17th Oct 2008 |
| 113.30.64.0/21 | 2k | APNIC | KR | 17th Oct 2008 |
| 113.30.72.0/21 | 2k | APNIC | KR | 17th Oct 2008 |
| 113.30.80.0/20 | 4.1k | APNIC | KR | 17th Oct 2008 |
| 113.30.96.0/20 | 4.1k | APNIC | KR | 17th Oct 2008 |
| 114.110.192.0/18 | 16.4k | APNIC | KR | 13th Jan 2011 |
| 114.110.24.0/21 | 2k | APNIC | KR | 23rd May 2008 |
| 114.141.0.0/20 | 4.1k | APNIC | KR | 13th Jun 2008 |
| 114.141.16.0/21 | 2k | APNIC | KR | 13th Jun 2008 |
| 114.141.40.0/21 | 2k | APNIC | KR | 16th Jun 2008 |
| 114.29.160.0/19 | 8.2k | APNIC | KR | 22nd Apr 2008 |
| 115.187.80.0/21 | 2k | APNIC | KR | 19th Sept 2008 |
| 116.68.232.0/21 | 2k | APNIC | KR | 17th May 2007 |
| 119.161.0.0/19 | 8.2k | APNIC | KR | 22nd Feb 2008 |
| 119.235.192.0/20 | 4.1k | APNIC | KR | 7th Mar 2008 |
| 120.143.192.0/18 | 16.4k | APNIC | KR | 22nd Apr 2008 |
| 122.0.8.0/21 | 2k | APNIC | KR | 26th Sept 2006 |
| 122.100.32.0/19 | 8.2k | APNIC | KR | 12th Oct 2006 |
| 122.152.96.0/19 | 8.2k | APNIC | KR | 30th Dec 2010 |
| 123.0.0.0/20 | 4.1k | APNIC | KR | 27th Dec 2006 |
| 123.108.0.0/21 | 2k | APNIC | KR | 31st Jan 2007 |
| 123.250.0.0/15 | 131k | APNIC | KR | 29th Jan 2007 |
| 124.217.192.0/19 | 8.2k | APNIC | KR | 2nd Nov 2007 |
| 125.60.96.0/19 | 8.2k | APNIC | KR | 2nd Sept 2005 |
| 139.150.96.0/19 | 8.2k | APNIC | KR | 9th Mar 2011 |
| 144.48.100.0/22 | 1k | APNIC | KR | 11th Apr 2016 |
| 144.48.40.0/22 | 1k | APNIC | KR | 7th Apr 2016 |
| 144.48.44.0/22 | 1k | APNIC | KR | 7th Apr 2016 |
| 150.129.224.0/22 | 1k | APNIC | KR | 1st Jul 2014 |
| 160.202.176.0/22 | 1k | APNIC | KR | 1st Apr 2016 |