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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,041 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 163.128.152.0/23 | 512 | APNIC |  CN | 3rd Apr 2026 |
| 163.128.158.0/23 | 512 | APNIC |  ID | 7th Apr 2026 |
| 163.128.168.0/23 | 512 | APNIC |  IN | 7th Apr 2026 |
| 163.128.17.0/24 | 256 | APNIC | ID | 6th Mar 2026 |
| 163.128.174.0/23 | 512 | APNIC | IN | 8th Apr 2026 |
| 163.128.182.0/24 | 256 | APNIC |  PH | 9th Apr 2026 |
| 163.128.190.0/24 | 256 | APNIC |  VU | 10th Apr 2026 |
| 163.128.191.0/24 | 256 | APNIC | ID | 10th Apr 2026 |
| 163.128.194.0/24 | 256 | APNIC |  AU | 10th Apr 2026 |
| 163.128.195.0/24 | 256 | APNIC | ID | 10th Apr 2026 |
| 163.128.207.0/24 | 256 | APNIC | ID | 11th Apr 2026 |
| 163.128.222.0/23 | 512 | APNIC | IN | 13th Apr 2026 |
| 163.128.224.0/23 | 512 | APNIC | IN | 13th Apr 2026 |
| 163.128.228.0/23 | 512 | APNIC | IN | 14th Apr 2026 |
| 163.128.232.0/23 | 512 | APNIC | IN | 14th Apr 2026 |
| 163.128.236.0/23 | 512 | APNIC | CN | 15th Apr 2026 |
| 163.128.241.0/24 | 256 | APNIC | ID | 16th Apr 2026 |
| 163.128.244.0/23 | 512 | APNIC | AU | 16th Apr 2026 |
| 163.128.246.0/24 | 256 | APNIC |  MY | 17th Apr 2026 |
| 163.128.247.0/24 | 256 | APNIC | AU | 17th Apr 2026 |
| 163.128.250.0/23 | 512 | APNIC | IN | 17th Apr 2026 |
| 163.128.26.0/23 | 512 | APNIC |  JP | 9th Mar 2026 |
| 163.128.30.0/23 | 512 | APNIC | CN | 9th Mar 2026 |
| 163.128.4.0/23 | 512 | APNIC |  MN | 3rd Mar 2026 |
| 163.128.40.0/23 | 512 | APNIC | PH | 10th Mar 2026 |
| 163.128.58.0/23 | 512 | APNIC | ID | 16th Mar 2026 |
| 163.128.62.0/23 | 512 | APNIC |  SG | 16th Mar 2026 |
| 163.128.67.0/24 | 256 | APNIC | IN | 16th Mar 2026 |
| 163.128.68.0/24 | 256 | APNIC | IN | 16th Mar 2026 |
| 163.128.70.0/23 | 512 | APNIC | ID | 17th Mar 2026 |
| 163.128.80.0/23 | 512 | APNIC | IN | 18th Mar 2026 |
| 163.128.82.0/23 | 512 | APNIC | ID | 18th Mar 2026 |
| 163.128.84.0/23 | 512 | APNIC | IN | 18th Mar 2026 |
| 163.128.94.0/24 | 256 | APNIC |  BD | 20th Mar 2026 |
| 163.128.96.0/24 | 256 | APNIC |  BT | 23rd Mar 2026 |
| 163.128.97.0/24 | 256 | APNIC | AU | 23rd Mar 2026 |
| 163.132.0.0/16 | 65.5k | APNIC | JP | 30th Nov 1992 |
| 163.133.0.0/16 | 65.5k | APNIC | JP | 30th Nov 1992 |
| 163.136.0.0/16 | 65.5k | APNIC | JP | 30th Nov 1992 |
| 163.141.0.0/16 | 65.5k | APNIC | JP | 30th Nov 1992 |
| 163.146.0.0/16 | 65.5k | APNIC | JP | 30th Nov 1992 |
| 163.147.0.0/16 | 65.5k | APNIC | JP | 30th Nov 1992 |
| 163.149.0.0/16 | 65.5k | APNIC | JP | 1st Dec 1992 |
| 163.154.0.0/16 | 65.5k | ARIN |  US | 18th Jul 2018 |
| 163.163.0.0/16 | 65.5k | RIPE NCC |  BE | 27th Aug 1992 |
| 163.165.0.0/17 | 32.8k | ARIN | US | 20th Feb 2024 |
| 163.168.0.0/16 | 65.5k | RIPE NCC |  CH | 7th Sept 1992 |
| 163.169.0.0/16 | 65.5k | RIPE NCC |  GB | 8th Sept 1992 |
| 163.175.0.0/16 | 65.5k | RIPE NCC |  NL | 26th Oct 1992 |
| 163.182.164.0/24 | 256 | ARIN |  CA | 8th Jan 2020 |