Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
- Baseline (neutral) 65
- Hosting allocation −6
- Trust score 59 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 159.135.128.0/18 | 16.4K |
2.8%
|
Rackspace Ltd. | DE | — | — |
| 159.135.80.0/20 | 4.1K |
0.0%
|
Rackspace Ltd. | US | — | — |
| 72.21.36.0/22 | 1.0K |
3.0%
|
Rackspace Ltd. | US | — | — |
| 147.75.24.0/22 | 1.0K |
0.0%
|
Rackspace Ltd. | US | — | — |
| 185.16.216.0/22 | 1.0K |
1.1%
|
Rackspace Ltd. | US | — | — |
| 185.205.104.0/22 | 1.0K |
0.0%
|
Rackspace Ltd. | DE | — | — |
| 192.68.42.0/24 | 256 |
2.0%
|
Rackspace Ltd. | NL | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS39921 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 72.21.36.0/22 | 13,578 | 2026-07-20 05:23:10 |
| 147.75.24.0/22 | 12,732 | 2026-07-20 05:59:13 |
| 159.135.128.0/19 | 12,624 | 2026-07-20 05:59:13 |
| 159.135.160.0/19 | 12,620 | 2026-07-20 05:59:13 |
| 185.16.216.0/22 | 12,100 | 2026-07-20 05:59:13 |
| 192.68.42.0/24 | 11,189 | 2026-07-20 05:59:13 |
| 185.205.104.0/22 | 10,874 | 2026-07-20 05:59:13 |
| 159.135.80.0/20 | 3,461 | 2026-07-20 05:36:11 |
Frequently Asked Questions
What is AS39921?
AS39921 is an Autonomous System Number assigned to Rackspace Ltd.. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).
How many IP addresses does AS39921 announce?
AS39921 announces 24.8K IPv4 addresses distributed across 7 routed CIDR prefixes. The network is registered in Germany.
Who operates AS39921?
AS39921 is operated by Rackspace Ltd.. The organization is based in Germany. You can view all IP ranges and related ASNs on the organization page.
What country is AS39921 registered in?
AS39921 is registered in Germany. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
