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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,783 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.155.34.0/23 | 512 | APNIC |  CN | 26th Aug 2020 |
| 103.155.48.0/23 | 512 | APNIC | CN | 31st Aug 2020 |
| 103.155.80.0/23 | 512 | APNIC |  VN | 3rd Sept 2020 |
| 103.155.82.0/23 | 512 | APNIC | VN | 3rd Sept 2020 |
| 103.156.104.0/23 | 512 | APNIC | CN | 23rd Sept 2020 |
| 103.156.106.0/23 | 512 | APNIC |  IN | 23rd Sept 2020 |
| 103.156.116.0/23 | 512 | APNIC |  TW | 24th Sept 2020 |
| 103.156.158.0/23 | 512 | APNIC | CN | 28th Sept 2020 |
| 103.156.172.0/23 | 512 | APNIC | IN | 28th Sept 2020 |
| 103.156.182.0/23 | 512 | APNIC | IN | 29th Sept 2020 |
| 103.156.199.0/24 | 256 | APNIC |  AU | 30th Sept 2020 |
| 103.156.228.0/23 | 512 | APNIC | CN | 2nd Oct 2020 |
| 103.156.234.0/24 | 256 | APNIC |  ID | 5th Oct 2020 |
| 103.156.252.0/23 | 512 | APNIC | ID | 7th Oct 2020 |
| 103.156.254.0/23 | 512 | APNIC | ID | 7th Oct 2020 |
| 103.156.28.0/23 | 512 | APNIC | CN | 21st Sept 2020 |
| 103.156.62.0/23 | 512 | APNIC | IN | 21st Sept 2020 |
| 103.156.94.0/23 | 512 | APNIC | IN | 23rd Sept 2020 |
| 103.157.112.0/23 | 512 | APNIC | IN | 19th Oct 2020 |
| 103.157.120.0/23 | 512 | APNIC |  SG | 19th Oct 2020 |
| 103.157.142.0/23 | 512 | APNIC |  JP | 20th Oct 2020 |
| 103.157.162.0/23 | 512 | APNIC | IN | 21st Oct 2020 |
| 103.157.164.0/23 | 512 | APNIC | IN | 21st Oct 2020 |
| 103.157.173.0/24 | 256 | APNIC |  KH | 23rd Oct 2020 |
| 103.157.174.0/23 | 512 | APNIC | CN | 22nd Oct 2020 |
| 103.157.18.0/23 | 512 | APNIC | VN | 8th Oct 2020 |
| 103.157.198.0/23 | 512 | APNIC |  MY | 23rd Oct 2020 |
| 103.157.208.0/23 | 512 | APNIC |  KR | 26th Oct 2020 |
| 103.157.212.0/23 | 512 | APNIC | CN | 27th Oct 2020 |
| 103.157.234.0/23 | 512 | APNIC | CN | 27th Oct 2020 |
| 103.157.254.0/23 | 512 | APNIC | CN | 30th Oct 2020 |
| 103.157.30.0/23 | 512 | APNIC | CN | 8th Oct 2020 |
| 103.157.36.0/23 | 512 | APNIC | IN | 9th Oct 2020 |
| 103.157.6.0/24 | 256 | APNIC | ID | 7th Oct 2020 |
| 103.157.70.0/23 | 512 | APNIC | IN | 14th Oct 2020 |
| 103.157.76.0/23 | 512 | APNIC | ID | 15th Oct 2020 |
| 103.157.86.0/23 | 512 | APNIC | TW | 15th Oct 2020 |
| 103.158.135.0/24 | 256 | APNIC |  PK | 29th Jun 2023 |
| 103.158.156.0/23 | 512 | APNIC | IN | 12th Nov 2020 |
| 103.158.16.0/23 | 512 | APNIC | CN | 2nd Nov 2020 |
| 103.158.164.0/23 | 512 | APNIC | ID | 13th Nov 2020 |
| 103.158.174.0/23 | 512 | APNIC | IN | 13th Nov 2020 |
| 103.158.178.0/23 | 512 | APNIC | IN | 16th Nov 2020 |
| 103.158.180.0/24 | 256 | APNIC | IN | 16th Nov 2020 |
| 103.158.188.0/23 | 512 | APNIC | ID | 17th Nov 2020 |
| 103.158.192.0/23 | 512 | APNIC | ID | 17th Nov 2020 |
| 103.158.200.0/23 | 512 | APNIC | CN | 18th Nov 2020 |
| 103.158.216.0/23 | 512 | APNIC | IN | 18th Nov 2020 |
| 103.158.224.0/23 | 512 | APNIC | CN | 18th Nov 2020 |
| 103.158.238.0/24 | 256 | APNIC | IN | 19th Nov 2020 |