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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 1.16.128.0/17 | 32.8k | APNIC |  KR | 12th May 2010 |
| 1.16.64.0/18 | 16.4k | APNIC | KR | 12th May 2010 |
| 1.17.0.0/16 | 65.5k | APNIC | KR | 12th May 2010 |
| 1.18.0.0/18 | 16.4k | APNIC | KR | 12th May 2010 |
| 1.18.112.0/22 | 1k | APNIC | KR | 12th May 2010 |
| 1.18.136.0/21 | 2k | APNIC | KR | 12th May 2010 |
| 1.18.144.0/20 | 4.1k | APNIC | KR | 12th May 2010 |
| 1.18.160.0/19 | 8.2k | APNIC | KR | 12th May 2010 |
| 1.18.192.0/18 | 16.4k | APNIC | KR | 12th May 2010 |
| 1.18.64.0/19 | 8.2k | APNIC | KR | 12th May 2010 |
| 1.18.96.0/20 | 4.1k | APNIC | KR | 12th May 2010 |
| 1.19.0.0/16 | 65.5k | APNIC | KR | 12th May 2010 |
| 101.101.176.0/20 | 4.1k | APNIC | KR | 28th Feb 2011 |
| 101.55.67.0/24 | 256 | APNIC | KR | 10th Feb 2011 |
| 101.79.128.0/21 | 2k | APNIC | KR | 17th Dec 2010 |
| 101.79.138.0/23 | 512 | APNIC | KR | 17th Dec 2010 |
| 101.79.140.0/22 | 1k | APNIC | KR | 17th Dec 2010 |
| 101.79.176.0/21 | 2k | APNIC | KR | 17th Dec 2010 |
| 101.79.184.0/22 | 1k | APNIC | KR | 17th Dec 2010 |
| 101.79.188.0/22 | 1k | APNIC | KR | 17th Dec 2010 |
| 101.79.192.0/20 | 4.1k | APNIC | KR | 17th Dec 2010 |
| 101.79.252.0/23 | 512 | APNIC | KR | 17th Dec 2010 |
| 101.79.4.0/22 | 1k | APNIC | KR | 17th Dec 2010 |
| 101.79.40.0/22 | 1k | APNIC | KR | 17th Dec 2010 |
| 101.79.44.0/22 | 1k | APNIC | KR | 17th Dec 2010 |
| 101.79.48.0/20 | 4.1k | APNIC | KR | 17th Dec 2010 |
| 101.79.76.0/22 | 1k | APNIC | KR | 17th Dec 2010 |
| 101.79.88.0/22 | 1k | APNIC | KR | 17th Dec 2010 |
| 101.79.96.0/19 | 8.2k | APNIC | KR | 17th Dec 2010 |
| 103.109.64.0/22 | 1k | APNIC | KR | 9th Feb 2018 |
| 103.13.160.0/22 | 1k | APNIC | KR | 25th Jul 2012 |
| 103.150.162.0/23 | 512 | APNIC | KR | 20th Apr 2020 |
| 103.157.208.0/23 | 512 | APNIC | KR | 26th Oct 2020 |
| 103.161.4.0/23 | 512 | APNIC | KR | 29th Dec 2020 |
| 103.167.230.0/23 | 512 | APNIC | KR | 4th Jun 2021 |
| 103.178.34.0/23 | 512 | APNIC | KR | 16th Dec 2021 |
| 103.2.76.0/22 | 1k | APNIC | KR | 20th Apr 2011 |
| 103.2.84.0/22 | 1k | APNIC | KR | 20th Apr 2011 |
| 103.212.248.0/22 | 1k | APNIC | KR | 1st Apr 2016 |
| 103.214.24.0/22 | 1k | APNIC | KR | 7th Apr 2016 |
| 103.230.112.0/22 | 1k | APNIC | KR | 30th Apr 2014 |
| 103.231.128.0/22 | 1k | APNIC | KR | 13th May 2014 |
| 103.235.24.0/22 | 1k | APNIC | KR | 1st Jul 2014 |
| 103.238.248.0/22 | 1k | APNIC | KR | 29th Jul 2014 |
| 103.239.236.0/22 | 1k | APNIC | KR | 8th Aug 2014 |
| 103.240.28.0/22 | 1k | APNIC | KR | 8th Aug 2013 |
| 103.246.236.0/22 | 1k | APNIC | KR | 31st Aug 2011 |
| 103.247.220.0/22 | 1k | APNIC | KR | 9th Feb 2012 |
| 103.25.16.0/22 | 1k | APNIC | KR | 26th Apr 2013 |
| 103.30.108.0/22 | 1k | APNIC | KR | 2nd Nov 2012 |