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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,954 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.247.96.0/22 | 1k | APNIC |  IN | 25th Jan 2012 |
| 103.248.0.0/23 | 512 | APNIC |  CN | 10th May 2013 |
| 103.248.100.0/22 | 1k | APNIC | CN | 17th May 2013 |
| 103.248.124.0/22 | 1k | APNIC | CN | 20th May 2013 |
| 103.248.168.0/22 | 1k | APNIC | CN | 21st May 2013 |
| 103.248.180.0/22 | 1k | APNIC |  HK | 6th Nov 2015 |
| 103.248.192.0/22 | 1k | APNIC | CN | 23rd May 2013 |
| 103.248.201.0/24 | 256 | APNIC |  SG | 18th Sept 2023 |
| 103.248.212.0/22 | 1k | APNIC | CN | 24th May 2013 |
| 103.248.230.0/23 | 512 | APNIC |  VN | 7th Aug 2023 |
| 103.248.249.0/24 | 256 | APNIC |  NL | 28th May 2013 |
| 103.248.251.0/24 | 256 | APNIC |  JP | 30th May 2013 |
| 103.248.52.0/22 | 1k | APNIC | IN | 12th Aug 2016 |
| 103.248.98.0/24 | 256 | APNIC | SG | 17th May 2013 |
| 103.249.0.0/22 | 1k | APNIC |  BD | 27th May 2013 |
| 103.249.12.0/22 | 1k | APNIC | CN | 28th May 2013 |
| 103.249.128.0/22 | 1k | APNIC | CN | 6th Jun 2013 |
| 103.249.144.0/22 | 1k | APNIC | CN | 6th Jun 2013 |
| 103.249.164.0/22 | 1k | APNIC | CN | 7th Jun 2013 |
| 103.249.168.0/22 | 1k | APNIC | CN | 7th Jun 2013 |
| 103.249.172.0/22 | 1k | APNIC | CN | 7th Jun 2013 |
| 103.249.176.0/22 | 1k | APNIC | CN | 7th Jun 2013 |
| 103.249.188.0/22 | 1k | APNIC | CN | 7th Jun 2013 |
| 103.249.192.0/22 | 1k | APNIC | CN | 7th Jun 2013 |
| 103.249.210.0/24 | 256 | APNIC |  ID | 11th Jun 2013 |
| 103.249.220.0/22 | 1k | APNIC |  AU | 11th Jun 2013 |
| 103.249.228.0/22 | 1k | APNIC |  PK | 11th Jun 2013 |
| 103.249.52.0/22 | 1k | APNIC | CN | 31st May 2013 |
| 103.249.58.0/23 | 512 | APNIC | ID | 31st May 2013 |
| 103.249.8.0/22 | 1k | APNIC | CN | 6th Nov 2015 |
| 103.25.0.0/22 | 1k | APNIC | IN | 24th Apr 2013 |
| 103.25.104.0/22 | 1k | APNIC | HK | 30th Apr 2013 |
| 103.25.116.0/22 | 1k | APNIC |  NZ | 1st May 2013 |
| 103.25.148.0/22 | 1k | APNIC | CN | 2nd May 2013 |
| 103.25.16.0/22 | 1k | APNIC |  KR | 26th Apr 2013 |
| 103.25.165.0/24 | 256 | APNIC | ID | 7th May 2013 |
| 103.25.184.0/23 | 512 | APNIC | ID | 25th Oct 2022 |
| 103.25.186.0/23 | 512 | APNIC | ID | 25th Oct 2022 |
| 103.25.198.0/23 | 512 | APNIC |  PH | 8th May 2013 |
| 103.25.212.0/22 | 1k | APNIC | AU | 8th May 2013 |
| 103.25.216.0/22 | 1k | APNIC | CN | 8th May 2013 |
| 103.25.221.0/24 | 256 | APNIC | AU | 9th May 2013 |
| 103.25.224.0/22 | 1k | APNIC | IN | 8th May 2013 |
| 103.25.236.0/22 | 1k | APNIC |  TW | 9th May 2013 |
| 103.25.28.0/22 | 1k | APNIC | CN | 26th Apr 2013 |
| 103.25.32.0/22 | 1k | APNIC | CN | 26th Apr 2013 |
| 103.25.40.0/22 | 1k | APNIC | CN | 26th Apr 2013 |
| 103.25.48.0/22 | 1k | APNIC | CN | 26th Apr 2013 |
| 103.25.68.0/22 | 1k | APNIC | CN | 29th Apr 2013 |
| 103.250.110.0/23 | 512 | APNIC | IN | 8th Aug 2023 |