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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,954 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 57.39.0.0/16 | 65.5k | RIPE NCC |  CH | 21st Jun 1993 |
| 57.4.0.0/15 | 131k | RIPE NCC |  BE | 21st Jun 1993 |
| 57.40.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.47.0.0/16 | 65.5k | RIPE NCC | BE | 21st Jun 1993 |
| 57.48.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.51.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.53.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.56.0.0/14 | 262k | RIPE NCC | CH | 21st Jun 1993 |
| 57.6.0.0/16 | 65.5k | RIPE NCC | BE | 21st Jun 1993 |
| 57.60.0.0/16 | 65.5k | RIPE NCC | CH | 21st Jun 1993 |
| 57.7.0.0/16 | 65.5k | RIPE NCC |  IE | 21st Jun 1993 |
| 57.8.0.0/14 | 262k | RIPE NCC | CH | 21st Jun 1993 |
| 57.92.0.0/16 | 65.5k | RIPE NCC | IE | 21st Jun 1993 |
| 58.137.178.0/24 | 256 | APNIC |  TH | 3rd Apr 2006 |
| 58.137.74.0/24 | 256 | APNIC | TH | 3rd Apr 2006 |
| 58.138.192.0/18 | 16.4k | APNIC |  KR | 3rd Aug 2006 |
| 58.145.240.0/20 | 4.1k | APNIC |  JP | 14th Jun 2005 |
| 58.65.232.0/21 | 2k | APNIC |  CN | 12th Apr 2011 |
| 58.68.0.0/17 | 32.8k | APNIC |  IN | 21st Mar 2005 |
| 58.83.0.0/17 | 32.8k | APNIC | CN | 30th Mar 2005 |
| 58.84.208.0/21 | 2k | APNIC |  AU | 21st Sept 2006 |
| 58.84.56.0/23 | 512 | APNIC | IN | 5th Oct 2015 |
| 58.96.160.0/19 | 8.2k | APNIC |  HK | 16th Dec 2010 |
| 58.97.136.0/21 | 2k | APNIC |  BD | 7th Jan 2011 |
| 59.107.128.0/17 | 32.8k | APNIC | CN | 22nd Mar 2006 |
| 59.150.110.0/23 | 512 | APNIC | KR | 8th Nov 2004 |
| 59.150.112.0/21 | 2k | APNIC | KR | 8th Nov 2004 |
| 59.150.120.0/23 | 512 | APNIC | KR | 8th Nov 2004 |
| 59.150.122.0/24 | 256 | APNIC | KR | 8th Nov 2004 |
| 59.150.125.0/24 | 256 | APNIC | KR | 8th Nov 2004 |
| 59.150.126.0/23 | 512 | APNIC | KR | 8th Nov 2004 |
| 59.150.13.0/24 | 256 | APNIC | KR | 8th Nov 2004 |
| 59.150.135.0/24 | 256 | APNIC | KR | 8th Nov 2004 |
| 59.150.136.0/24 | 256 | APNIC | KR | 8th Nov 2004 |
| 59.150.138.0/24 | 256 | APNIC | KR | 8th Nov 2004 |
| 59.150.141.0/24 | 256 | APNIC | KR | 8th Nov 2004 |
| 59.150.146.0/23 | 512 | APNIC | KR | 8th Nov 2004 |
| 59.150.148.0/23 | 512 | APNIC | KR | 8th Nov 2004 |
| 59.150.15.0/24 | 256 | APNIC | KR | 8th Nov 2004 |
| 59.150.151.0/24 | 256 | APNIC | KR | 8th Nov 2004 |
| 59.150.157.0/24 | 256 | APNIC | KR | 8th Nov 2004 |
| 59.150.158.0/23 | 512 | APNIC | KR | 8th Nov 2004 |
| 59.150.160.0/22 | 1k | APNIC | KR | 8th Nov 2004 |
| 59.150.164.0/24 | 256 | APNIC | KR | 8th Nov 2004 |
| 59.150.166.0/23 | 512 | APNIC | KR | 8th Nov 2004 |
| 59.150.171.0/24 | 256 | APNIC | KR | 8th Nov 2004 |
| 59.150.173.0/24 | 256 | APNIC | KR | 8th Nov 2004 |
| 59.150.174.0/23 | 512 | APNIC | KR | 8th Nov 2004 |
| 59.150.176.0/20 | 4.1k | APNIC | KR | 8th Nov 2004 |
| 59.150.18.0/24 | 256 | APNIC | KR | 8th Nov 2004 |