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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,356 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 218.214.0.0/16 | 65.5k | APNIC |  AU | 19th Jun 2003 |
| 218.215.0.0/16 | 65.5k | APNIC | AU | 21st Jan 2005 |
| 218.244.64.0/19 | 8.2k | APNIC |  CN | 30th Nov 2001 |
| 218.244.96.0/19 | 8.2k | APNIC | CN | 30th Nov 2001 |
| 218.33.128.0/17 | 32.8k | APNIC |  JP | 4th Dec 2003 |
| 218.98.224.0/19 | 8.2k | APNIC | CN | 22nd Jun 2001 |
| 218.99.0.0/16 | 65.5k | APNIC | CN | 22nd Jun 2001 |
| 219.0.0.0/13 | 524k | APNIC | JP | 31st Oct 2001 |
| 219.151.64.0/18 | 16.4k | APNIC | CN | 21st Mar 2002 |
| 219.73.128.0/17 | 32.8k | APNIC | JP | 23rd Aug 2006 |
| 219.90.68.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 219.90.72.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 219.90.76.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 220.101.128.0/18 | 16.4k | APNIC | AU | 28th Jan 2004 |
| 220.145.0.0/17 | 32.8k | APNIC | JP | 28th Nov 2002 |
| 220.145.128.0/18 | 16.4k | APNIC | JP | 28th Nov 2002 |
| 220.150.18.0/24 | 256 | APNIC | JP | 22nd Jan 2004 |
| 220.150.200.0/24 | 256 | APNIC | JP | 22nd Jan 2004 |
| 220.150.201.0/24 | 256 | APNIC | JP | 22nd Jan 2004 |
| 220.150.202.0/23 | 512 | APNIC | JP | 22nd Jan 2004 |
| 220.150.204.0/24 | 256 | APNIC | JP | 22nd Jan 2004 |
| 220.150.205.0/24 | 256 | APNIC | JP | 22nd Jan 2004 |
| 220.150.206.0/23 | 512 | APNIC | JP | 22nd Jan 2004 |
| 220.150.218.0/23 | 512 | APNIC | JP | 22nd Jan 2004 |
| 220.150.220.0/23 | 512 | APNIC | JP | 22nd Jan 2004 |
| 220.150.222.0/24 | 256 | APNIC | JP | 22nd Jan 2004 |
| 220.150.32.0/22 | 1k | APNIC | JP | 22nd Jan 2004 |
| 220.150.36.0/23 | 512 | APNIC | JP | 22nd Jan 2004 |
| 220.150.38.0/24 | 256 | APNIC | JP | 22nd Jan 2004 |
| 220.150.39.0/24 | 256 | APNIC | JP | 22nd Jan 2004 |
| 220.150.40.0/22 | 1k | APNIC | JP | 22nd Jan 2004 |
| 220.150.44.0/23 | 512 | APNIC | JP | 22nd Jan 2004 |
| 220.150.46.0/24 | 256 | APNIC | JP | 22nd Jan 2004 |
| 220.150.47.0/24 | 256 | APNIC | JP | 22nd Jan 2004 |
| 220.150.65.0/24 | 256 | APNIC | JP | 22nd Jan 2004 |
| 220.150.80.0/23 | 512 | APNIC | JP | 22nd Jan 2004 |
| 220.150.82.0/24 | 256 | APNIC | JP | 22nd Jan 2004 |
| 220.150.84.0/22 | 1k | APNIC | JP | 22nd Jan 2004 |
| 220.150.88.0/24 | 256 | APNIC | JP | 22nd Jan 2004 |
| 220.152.128.0/17 | 32.8k | APNIC | CN | 25th Aug 2006 |
| 220.155.0.0/16 | 65.5k | APNIC | CN | 16th Aug 2006 |
| 220.157.96.0/20 | 4.1k | APNIC |  ID | 11th Sept 2006 |
| 220.158.152.0/22 | 1k | APNIC |  IN | 6th Oct 2015 |
| 220.158.188.0/22 | 1k | APNIC | AU | 6th Oct 2015 |
| 220.158.240.0/22 | 1k | APNIC | CN | 8th Oct 2015 |
| 220.158.32.0/20 | 4.1k | ARIN |  US | 26th Jun 2024 |
| 220.232.0.0/19 | 8.2k | APNIC |  SG | 19th Jan 2004 |
| 220.232.152.0/22 | 1k | APNIC |  HK | 19th Nov 2004 |
| 220.232.162.0/23 | 512 | APNIC | JP | 19th Nov 2004 |
| 220.232.164.0/23 | 512 | APNIC | JP | 19th Nov 2004 |