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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,954 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.244.84.0/22 | 1k | APNIC |  CN | 12th Dec 2012 |
| 103.244.94.0/23 | 512 | APNIC |  IN | 28th Jul 2023 |
| 103.245.120.0/23 | 512 | APNIC |  MY | 11th Jan 2013 |
| 103.245.124.0/22 | 1k | APNIC | CN | 11th Jan 2013 |
| 103.245.146.0/24 | 256 | APNIC |  AU | 17th Jan 2013 |
| 103.245.167.0/24 | 256 | APNIC |  LA | 18th Jan 2013 |
| 103.245.168.0/23 | 512 | APNIC |  ID | 1st Aug 2023 |
| 103.245.170.0/23 | 512 | APNIC | IN | 1st Aug 2023 |
| 103.245.177.0/24 | 256 | APNIC | ID | 22nd Jan 2013 |
| 103.245.208.0/22 | 1k | APNIC | MY | 23rd Jan 2013 |
| 103.245.223.0/24 | 256 | APNIC |  SG | 24th Jan 2013 |
| 103.245.224.0/24 | 256 | APNIC |  JP | 24th Jan 2013 |
| 103.245.23.0/24 | 256 | APNIC | CN | 7th Jan 2013 |
| 103.245.238.0/23 | 512 | APNIC |  VN | 1st Aug 2023 |
| 103.245.52.0/22 | 1k | APNIC | CN | 7th Jan 2013 |
| 103.245.57.0/24 | 256 | APNIC | ID | 31st Jul 2023 |
| 103.245.60.0/22 | 1k | APNIC | CN | 8th Jan 2013 |
| 103.245.80.0/22 | 1k | APNIC | CN | 22nd Jan 2013 |
| 103.246.12.0/22 | 1k | APNIC | CN | 29th Jun 2011 |
| 103.246.120.0/22 | 1k | APNIC | CN | 17th May 2011 |
| 103.246.124.0/22 | 1k | APNIC | CN | 17th May 2011 |
| 103.246.129.0/24 | 256 | APNIC | ID | 23rd Aug 2011 |
| 103.246.132.0/22 | 1k | APNIC | CN | 23rd Aug 2011 |
| 103.246.136.0/22 | 1k | APNIC | AU | 23rd Aug 2011 |
| 103.246.140.0/22 | 1k | APNIC | SG | 23rd Aug 2011 |
| 103.246.187.0/24 | 256 | APNIC | IN | 10th Dec 2015 |
| 103.246.196.0/22 | 1k | APNIC | IN | 26th Aug 2011 |
| 103.246.212.0/22 | 1k | APNIC | IN | 29th Aug 2011 |
| 103.246.232.0/24 | 256 | APNIC | JP | 31st Aug 2011 |
| 103.246.235.0/24 | 256 | APNIC | AU | 5th Sept 2011 |
| 103.246.236.0/22 | 1k | APNIC |  KR | 31st Aug 2011 |
| 103.246.32.0/22 | 1k | APNIC | AU | 5th Jul 2011 |
| 103.246.66.0/23 | 512 | APNIC | JP | 2nd Aug 2023 |
| 103.246.72.0/23 | 512 | APNIC | JP | 2nd Aug 2023 |
| 103.246.76.0/24 | 256 | APNIC | ID | 1st Jun 2011 |
| 103.246.8.0/22 | 1k | APNIC | CN | 29th Jun 2011 |
| 103.247.100.0/22 | 1k | APNIC | ID | 25th Jan 2012 |
| 103.247.126.0/23 | 512 | APNIC | ID | 31st Jan 2012 |
| 103.247.132.0/22 | 1k | APNIC | SG | 31st Jan 2012 |
| 103.247.144.0/22 | 1k | APNIC |  HK | 1st Feb 2012 |
| 103.247.16.0/23 | 512 | APNIC | ID | 13th Jan 2012 |
| 103.247.172.0/22 | 1k | APNIC | CN | 1st Feb 2012 |
| 103.247.18.0/24 | 256 | APNIC | ID | 17th Jan 2012 |
| 103.247.180.0/24 | 256 | APNIC | SG | 25th Nov 2015 |
| 103.247.198.0/24 | 256 | APNIC |  AF | 6th Feb 2012 |
| 103.247.200.0/22 | 1k | APNIC | CN | 6th Feb 2012 |
| 103.247.212.0/22 | 1k | APNIC | CN | 7th Feb 2012 |
| 103.247.220.0/22 | 1k | APNIC | KR | 9th Feb 2012 |
| 103.247.34.0/23 | 512 | APNIC | ID | 17th Jan 2012 |
| 103.247.40.0/22 | 1k | APNIC | ID | 18th Jan 2012 |