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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.48.96.0/22 | 1k | APNIC |  IN | 20th Jan 2015 |
| 103.49.104.0/23 | 512 | APNIC |  ID | 3rd Feb 2015 |
| 103.49.120.0/24 | 256 | APNIC | IN | 3rd Feb 2015 |
| 103.49.121.0/24 | 256 | APNIC | IN | 3rd Feb 2015 |
| 103.49.127.0/24 | 256 | APNIC |  AU | 4th Feb 2015 |
| 103.49.144.0/23 | 512 | APNIC | AU | 4th Feb 2015 |
| 103.49.16.0/23 | 512 | APNIC | AU | 29th Jan 2015 |
| 103.49.180.0/22 | 1k | APNIC |  CN | 5th Feb 2015 |
| 103.49.184.0/22 | 1k | APNIC | ID | 5th Feb 2015 |
| 103.49.19.0/24 | 256 | APNIC | AU | 30th Jan 2015 |
| 103.49.192.0/22 | 1k | APNIC | ID | 5th Feb 2015 |
| 103.49.20.0/22 | 1k | APNIC | CN | 29th Jan 2015 |
| 103.49.212.0/22 | 1k | APNIC |  HK | 6th Feb 2015 |
| 103.49.32.0/22 | 1k | APNIC |  US | 30th Jan 2015 |
| 103.49.72.0/22 | 1k | APNIC | CN | 2nd Feb 2015 |
| 103.49.76.0/22 | 1k | APNIC | CN | 2nd Feb 2015 |
| 103.49.96.0/22 | 1k | APNIC | CN | 3rd Feb 2015 |
| 103.5.122.0/23 | 512 | APNIC |  TH | 20th Sept 2011 |
| 103.5.151.0/24 | 256 | APNIC |  SG | 28th Sept 2011 |
| 103.5.152.0/22 | 1k | APNIC | CN | 29th Oct 2015 |
| 103.5.164.0/22 | 1k | APNIC | AU | 26th Sept 2011 |
| 103.5.168.0/22 | 1k | APNIC | CN | 29th Oct 2015 |
| 103.5.188.0/22 | 1k | RIPE NCC | US | 28th Sept 2011 |
| 103.5.199.0/24 | 256 | APNIC | SG | 29th Sept 2011 |
| 103.5.214.0/24 | 256 | APNIC | AU | 4th Oct 2011 |
| 103.5.215.0/24 | 256 | APNIC | ID | 5th Oct 2011 |
| 103.5.244.0/22 | 1k | APNIC | IN | 7th Oct 2011 |
| 103.5.252.0/22 | 1k | APNIC | CN | 10th Oct 2011 |
| 103.5.32.0/22 | 1k | APNIC |  TW | 8th Sept 2011 |
| 103.5.36.0/22 | 1k | APNIC | CN | 8th Sept 2011 |
| 103.5.48.0/23 | 512 | APNIC | ID | 12th Sept 2011 |
| 103.5.56.0/22 | 1k | APNIC | CN | 12th Sept 2011 |
| 103.5.68.0/23 | 512 | APNIC | AU | 12th Sept 2011 |
| 103.5.80.0/22 | 1k | APNIC |  NZ | 15th Sept 2011 |
| 103.5.92.0/22 | 1k | APNIC | AU | 16th Sept 2011 |
| 103.50.100.0/22 | 1k | APNIC | AU | 12th Feb 2015 |
| 103.50.108.0/22 | 1k | APNIC | CN | 12th Feb 2015 |
| 103.50.112.0/22 | 1k | APNIC | CN | 12th Feb 2015 |
| 103.50.116.0/22 | 1k | APNIC | CN | 12th Feb 2015 |
| 103.50.120.0/22 | 1k | APNIC | CN | 12th Feb 2015 |
| 103.50.124.0/22 | 1k | APNIC | CN | 12th Feb 2015 |
| 103.50.132.0/22 | 1k | APNIC | CN | 12th Feb 2015 |
| 103.50.136.0/22 | 1k | APNIC | CN | 12th Feb 2015 |
| 103.50.14.0/23 | 512 | RIPE NCC |  FR | 11th Feb 2015 |
| 103.50.140.0/22 | 1k | APNIC | CN | 12th Feb 2015 |
| 103.50.172.0/22 | 1k | APNIC | CN | 13th Feb 2015 |
| 103.50.176.0/22 | 1k | APNIC | CN | 13th Feb 2015 |
| 103.50.180.0/22 | 1k | APNIC | CN | 13th Feb 2015 |
| 103.50.184.0/22 | 1k | APNIC | CN | 13th Feb 2015 |
| 103.50.188.0/22 | 1k | APNIC | CN | 13th Feb 2015 |