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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through APNIC, largest first.
Unannounced blocks in South Korea
506 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.252.26.0/24 | 256 | APNIC |  KR | 29th Sept 1996 |
| 203.252.28.0/22 | 1k | APNIC | KR | 29th Sept 1996 |
| 203.253.112.0/20 | 4.1k | APNIC | KR | 29th Sept 1996 |
| 203.253.233.0/24 | 256 | APNIC | KR | 29th Sept 1996 |
| 203.253.48.0/22 | 1k | APNIC | KR | 29th Sept 1996 |
| 203.253.52.0/22 | 1k | APNIC | KR | 29th Sept 1996 |
| 203.253.56.0/21 | 2k | APNIC | KR | 29th Sept 1996 |
| 203.254.10.0/23 | 512 | APNIC | KR | 29th Sept 1996 |
| 203.254.12.0/22 | 1k | APNIC | KR | 29th Sept 1996 |
| 203.254.16.0/20 | 4.1k | APNIC | KR | 29th Sept 1996 |
| 203.254.174.0/24 | 256 | APNIC | KR | 29th Sept 1996 |
| 203.254.32.0/23 | 512 | APNIC | KR | 29th Sept 1996 |
| 203.254.34.0/23 | 512 | APNIC | KR | 29th Sept 1996 |
| 203.254.36.0/22 | 1k | APNIC | KR | 29th Sept 1996 |
| 203.254.41.0/24 | 256 | APNIC | KR | 29th Sept 1996 |
| 203.254.42.0/23 | 512 | APNIC | KR | 29th Sept 1996 |
| 203.254.44.0/22 | 1k | APNIC | KR | 29th Sept 1996 |
| 203.254.48.0/23 | 512 | APNIC | KR | 29th Sept 1996 |
| 203.254.50.0/24 | 256 | APNIC | KR | 29th Sept 1996 |
| 203.254.56.0/24 | 256 | APNIC | KR | 29th Sept 1996 |
| 203.254.57.0/24 | 256 | APNIC | KR | 29th Sept 1996 |
| 203.254.58.0/23 | 512 | APNIC | KR | 29th Sept 1996 |
| 203.254.60.0/22 | 1k | APNIC | KR | 29th Sept 1996 |
| 203.254.64.0/19 | 8.2k | APNIC | KR | 29th Sept 1996 |
| 203.254.8.0/24 | 256 | APNIC | KR | 29th Sept 1996 |
| 203.255.120.0/22 | 1k | APNIC | KR | 29th Sept 1996 |
| 203.255.124.0/22 | 1k | APNIC | KR | 29th Sept 1996 |
| 203.255.192.0/20 | 4.1k | APNIC | KR | 29th Sept 1996 |
| 203.255.208.0/22 | 1k | APNIC | KR | 29th Sept 1996 |
| 203.255.222.0/23 | 512 | APNIC | KR | 29th Sept 1996 |
| 203.255.235.0/24 | 256 | APNIC | KR | 29th Sept 1996 |
| 210.111.112.0/20 | 4.1k | APNIC | KR | 30th Apr 1997 |
| 210.111.64.0/20 | 4.1k | APNIC | KR | 30th Apr 1997 |
| 210.114.112.0/20 | 4.1k | APNIC | KR | 30th Apr 1997 |
| 210.114.128.0/19 | 8.2k | APNIC | KR | 30th Apr 1997 |
| 210.114.192.0/20 | 4.1k | APNIC | KR | 30th Apr 1997 |
| 210.114.64.0/20 | 4.1k | APNIC | KR | 30th Apr 1997 |
| 210.114.80.0/21 | 2k | APNIC | KR | 30th Apr 1997 |
| 210.114.96.0/21 | 2k | APNIC | KR | 30th Apr 1997 |
| 210.115.0.0/19 | 8.2k | APNIC | KR | 30th Apr 1997 |
| 210.115.64.0/19 | 8.2k | APNIC | KR | 30th Apr 1997 |
| 210.127.0.0/19 | 8.2k | APNIC | KR | 18th Jul 1996 |
| 210.205.96.0/20 | 4.1k | APNIC | KR | 25th May 1999 |
| 210.218.96.0/19 | 8.2k | APNIC | KR | 23rd Mar 1999 |
| 210.220.32.0/19 | 8.2k | APNIC | KR | 25th May 1999 |
| 210.221.160.0/19 | 8.2k | APNIC | KR | 25th May 1999 |
| 210.4.216.0/22 | 1k | APNIC | KR | 21st Sept 2007 |
| 210.97.196.0/22 | 1k | APNIC | KR | 14th Apr 1998 |
| 210.97.200.0/21 | 2k | APNIC | KR | 14th Apr 1998 |
| 210.97.208.0/20 | 4.1k | APNIC | KR | 14th Apr 1998 |