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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.55.204.0/22 | 1k | APNIC |  CN | 23rd Apr 2015 |
| 103.55.208.0/22 | 1k | APNIC | CN | 23rd Apr 2015 |
| 103.55.218.0/24 | 256 | APNIC |  HK | 24th Apr 2015 |
| 103.55.236.0/22 | 1k | APNIC | CN | 24th Apr 2015 |
| 103.55.244.0/22 | 1k | APNIC |  IN | 24th Apr 2015 |
| 103.55.32.0/24 | 256 | APNIC |  AU | 15th Apr 2015 |
| 103.55.56.0/23 | 512 | APNIC |  ID | 16th Apr 2015 |
| 103.55.80.0/22 | 1k | APNIC | CN | 17th Apr 2015 |
| 103.56.116.0/22 | 1k | APNIC | HK | 1st May 2015 |
| 103.56.120.0/22 | 1k | APNIC | IN | 1st May 2015 |
| 103.56.136.0/23 | 512 | APNIC | ID | 21st Dec 2022 |
| 103.56.138.0/23 | 512 | APNIC | ID | 21st Dec 2022 |
| 103.56.140.0/22 | 1k | APNIC | CN | 4th May 2015 |
| 103.56.151.0/24 | 256 | APNIC | AU | 5th May 2015 |
| 103.56.176.0/22 | 1k | APNIC | IN | 5th May 2015 |
| 103.56.184.0/22 | 1k | APNIC | CN | 6th May 2015 |
| 103.56.20.0/22 | 1k | APNIC | CN | 27th Apr 2015 |
| 103.56.200.0/22 | 1k | APNIC | CN | 6th May 2015 |
| 103.56.210.0/23 | 512 | APNIC | IN | 7th May 2015 |
| 103.56.220.0/22 | 1k | APNIC | IN | 8th May 2015 |
| 103.56.240.0/22 | 1k | APNIC | IN | 8th May 2015 |
| 103.56.244.0/22 | 1k | APNIC | IN | 8th May 2015 |
| 103.56.248.0/22 | 1k | APNIC | IN | 8th May 2015 |
| 103.56.252.0/22 | 1k | APNIC | IN | 8th May 2015 |
| 103.56.29.0/24 | 256 | APNIC | IN | 27th Apr 2015 |
| 103.56.32.0/22 | 1k | APNIC | CN | 27th Apr 2015 |
| 103.56.48.0/22 | 1k | APNIC |  JP | 28th Apr 2015 |
| 103.56.56.0/22 | 1k | APNIC | CN | 28th Apr 2015 |
| 103.56.64.0/22 | 1k | APNIC | IN | 28th Apr 2015 |
| 103.56.72.0/22 | 1k | APNIC | CN | 29th Apr 2015 |
| 103.56.94.0/23 | 512 | APNIC | CN | 21st Dec 2022 |
| 103.57.100.0/22 | 1k | APNIC | JP | 15th May 2015 |
| 103.57.104.0/22 | 1k | APNIC |  VN | 15th May 2015 |
| 103.57.120.0/22 | 1k | APNIC |  BD | 15th May 2015 |
| 103.57.144.0/22 | 1k | APNIC | JP | 21st May 2015 |
| 103.57.152.0/22 | 1k | APNIC |  PK | 18th May 2015 |
| 103.57.160.0/22 | 1k | APNIC | IN | 18th May 2015 |
| 103.57.180.0/22 | 1k | APNIC | IN | 19th May 2015 |
| 103.57.192.0/22 | 1k | APNIC | ID | 20th May 2015 |
| 103.57.196.0/22 | 1k | APNIC | CN | 20th May 2015 |
| 103.57.212.0/22 | 1k | APNIC | IN | 20th May 2015 |
| 103.57.28.0/22 | 1k | APNIC | JP | 12th May 2015 |
| 103.57.44.0/22 | 1k | APNIC | JP | 13th May 2015 |
| 103.57.52.0/22 | 1k | APNIC | CN | 13th May 2015 |
| 103.57.56.0/22 | 1k | APNIC | CN | 13th May 2015 |
| 103.57.76.0/22 | 1k | APNIC | CN | 14th May 2015 |
| 103.57.89.0/24 | 256 | APNIC | AU | 15th May 2015 |
| 103.57.91.0/24 | 256 | APNIC | AU | 19th May 2015 |
| 103.58.0.0/22 | 1k | APNIC | IN | 21st May 2015 |
| 103.58.112.0/24 | 256 | APNIC |  SG | 26th May 2015 |