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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in South Korea
511 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 211.233.96.0/19 | 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 |
| 218.37.132.0/22 | 1k | APNIC | KR | 22nd Jul 2002 |
| 218.37.136.0/21 | 2k | APNIC | KR | 22nd Jul 2002 |
| 218.37.144.0/20 | 4.1k | APNIC | KR | 22nd Jul 2002 |
| 218.37.160.0/19 | 8.2k | APNIC | KR | 22nd Jul 2002 |
| 223.130.240.0/20 | 4.1k | APNIC | KR | 29th Jul 2010 |
| 223.255.208.0/20 | 4.1k | APNIC | KR | 2nd Aug 2010 |