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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,356 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 210.87.123.0/24 | 256 | APNIC |  ID | 6th Dec 2023 |
| 210.87.67.0/24 | 256 | APNIC |  IN | 1st Dec 2023 |
| 210.87.72.0/23 | 512 | APNIC |  CN | 4th Dec 2023 |
| 210.88.128.0/20 | 4.1k | APNIC |  JP | 10th Dec 1998 |
| 210.88.16.0/20 | 4.1k | APNIC | JP | 22nd Oct 1997 |
| 210.88.192.0/20 | 4.1k | APNIC | JP | 22nd May 2000 |
| 210.88.208.0/21 | 2k | APNIC | JP | 22nd May 2000 |
| 210.88.216.0/22 | 1k | APNIC | JP | 22nd May 2000 |
| 210.88.220.0/23 | 512 | APNIC | JP | 22nd May 2000 |
| 210.88.222.0/24 | 256 | APNIC | JP | 22nd May 2000 |
| 210.88.223.0/24 | 256 | APNIC | JP | 22nd May 2000 |
| 210.88.224.0/21 | 2k | APNIC | JP | 27th Mar 2001 |
| 210.88.232.0/23 | 512 | APNIC | JP | 27th Mar 2001 |
| 210.88.236.0/22 | 1k | APNIC | JP | 27th Mar 2001 |
| 210.88.240.0/20 | 4.1k | APNIC | JP | 27th Mar 2001 |
| 210.88.32.0/20 | 4.1k | APNIC | JP | 22nd Oct 1997 |
| 210.88.48.0/21 | 2k | APNIC | JP | 22nd Oct 1997 |
| 210.88.64.0/19 | 8.2k | APNIC | JP | 22nd Oct 1997 |
| 210.88.96.0/19 | 8.2k | APNIC | JP | 10th Dec 1998 |
| 210.89.0.0/19 | 8.2k | APNIC | JP | 4th Jul 2001 |
| 210.89.47.0/24 | 256 | APNIC | IN | 22nd Jun 2006 |
| 210.89.50.0/24 | 256 | APNIC | IN | 22nd Jun 2006 |
| 210.89.53.0/24 | 256 | APNIC | IN | 22nd Jun 2006 |
| 210.89.57.0/24 | 256 | APNIC | IN | 22nd Jun 2006 |
| 210.89.60.0/24 | 256 | APNIC | IN | 22nd Jun 2006 |
| 210.89.96.0/22 | 1k | APNIC | JP | 6th Aug 2003 |
| 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 |
| 210.97.224.0/20 | 4.1k | APNIC | KR | 14th Apr 1998 |
| 210.98.192.0/19 | 8.2k | APNIC | KR | 23rd Mar 1998 |
| 211.101.64.0/18 | 16.4k | APNIC | CN | 14th Dec 1999 |
| 211.111.192.0/20 | 4.1k | APNIC | KR | 14th Apr 2000 |
| 211.116.160.0/20 | 4.1k | APNIC | KR | 14th Apr 2000 |
| 211.147.192.0/20 | 4.1k | APNIC | CN | 22nd Jun 2001 |
| 211.156.160.0/20 | 4.1k | APNIC | CN | 27th Jun 2000 |
| 211.156.176.0/20 | 4.1k | APNIC | CN | 27th Jun 2000 |
| 211.156.64.0/20 | 4.1k | APNIC | CN | 27th Jun 2000 |
| 211.156.80.0/20 | 4.1k | APNIC | CN | 27th Jun 2000 |
| 211.156.96.0/19 | 8.2k | APNIC | CN | 27th Jun 2000 |
| 211.167.160.0/20 | 4.1k | APNIC | CN | 9th Jun 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 |