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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 210.97.208.0/20 | 4.1k | APNIC |  KR | 14th Apr 1998 |
| 210.97.224.0/20 | 4.1k | APNIC | KR | 14th Apr 1998 |
| 210.98.192.0/19 | 8.2k | APNIC | KR | 23rd Mar 1998 |
| 211.111.192.0/20 | 4.1k | APNIC | KR | 14th Apr 2000 |
| 211.116.160.0/20 | 4.1k | APNIC | KR | 14th Apr 2000 |
| 211.172.112.0/20 | 4.1k | APNIC | KR | 26th May 2000 |
| 211.172.160.0/20 | 4.1k | APNIC | KR | 26th May 2000 |
| 211.172.176.0/21 | 2k | APNIC | KR | 26th May 2000 |
| 211.172.184.0/22 | 1k | APNIC | KR | 26th May 2000 |
| 211.172.188.0/22 | 1k | APNIC | KR | 26th May 2000 |
| 211.172.192.0/20 | 4.1k | APNIC | KR | 26th May 2000 |
| 211.172.224.0/22 | 1k | APNIC | KR | 26th May 2000 |
| 211.172.236.0/22 | 1k | APNIC | KR | 26th May 2000 |
| 211.172.80.0/20 | 4.1k | APNIC | KR | 26th May 2000 |
| 211.174.16.0/20 | 4.1k | APNIC | KR | 26th May 2000 |
| 211.190.144.0/20 | 4.1k | APNIC | KR | 26th May 2000 |
| 211.190.160.0/19 | 8.2k | APNIC | KR | 26th May 2000 |
| 211.190.192.0/19 | 8.2k | APNIC | KR | 26th May 2000 |
| 211.190.48.0/20 | 4.1k | APNIC | KR | 26th May 2000 |
| 211.190.64.0/19 | 8.2k | APNIC | KR | 26th May 2000 |
| 211.190.96.0/20 | 4.1k | APNIC | KR | 26th May 2000 |
| 211.191.144.0/20 | 4.1k | APNIC | KR | 26th May 2000 |
| 211.191.16.0/20 | 4.1k | APNIC | KR | 26th May 2000 |
| 211.191.192.0/19 | 8.2k | APNIC | KR | 26th May 2000 |
| 211.191.224.0/20 | 4.1k | APNIC | KR | 26th May 2000 |
| 211.191.48.0/20 | 4.1k | APNIC | KR | 26th May 2000 |
| 211.191.96.0/20 | 4.1k | APNIC | KR | 26th May 2000 |
| 211.233.144.0/20 | 4.1k | APNIC | KR | 8th Sept 2000 |
| 211.233.160.0/19 | 8.2k | APNIC | KR | 8th Sept 2000 |
| 211.233.192.0/18 | 16.4k | APNIC | KR | 8th Sept 2000 |
| 211.233.96.0/19 | 8.2k | APNIC | KR | 8th Sept 2000 |
| 211.235.0.0/19 | 8.2k | APNIC | KR | 8th Sept 2000 |
| 211.236.164.0/22 | 1k | APNIC | KR | 8th Sept 2000 |
| 211.236.176.0/22 | 1k | APNIC | KR | 8th Sept 2000 |
| 211.254.240.0/21 | 2k | APNIC | KR | 8th Sept 2000 |
| 211.254.248.0/22 | 1k | APNIC | KR | 8th Sept 2000 |
| 211.35.100.0/22 | 1k | APNIC | KR | 27th Aug 1999 |
| 211.35.104.0/21 | 2k | APNIC | KR | 27th Aug 1999 |
| 211.35.112.0/20 | 4.1k | APNIC | KR | 27th Aug 1999 |
| 211.35.80.0/20 | 4.1k | APNIC | KR | 27th Aug 1999 |
| 211.36.96.0/19 | 8.2k | APNIC | KR | 27th Aug 1999 |
| 211.47.164.0/22 | 1k | APNIC | KR | 18th Nov 1999 |
| 211.47.168.0/21 | 2k | APNIC | KR | 18th Nov 1999 |
| 211.47.240.0/20 | 4.1k | APNIC | KR | 18th Nov 1999 |
| 211.56.16.0/20 | 4.1k | APNIC | KR | 16th Feb 2000 |
| 211.61.96.0/20 | 4.1k | APNIC | KR | 16th Feb 2000 |
| 211.63.96.0/19 | 8.2k | APNIC | KR | 16th Feb 2000 |
| 223.130.240.0/20 | 4.1k | APNIC | KR | 29th Jul 2010 |
| 223.255.208.0/20 | 4.1k | APNIC | KR | 2nd Aug 2010 |
| 23.142.12.0/24 | 256 | ARIN | KR | 18th Jul 2025 |