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 v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
AS51821 — global IP footprint
Cities where AS51821 has measurable IPv4 allocation. Click any dot to open that city's page. Size and color scale with IP count.
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 193.234.102.0/23 | 512 |
1.4%
|
Cloudist AB | SE | — | — |
| 194.103.198.0/23 | 512 |
0.2%
|
Cloudist AB | SE | Stockholm County | Stockholm |
| 91.216.62.0/24 | 256 |
0.0%
|
Cloudist AB | SE | — | — |
| 192.176.243.0/24 | 256 |
0.0%
|
Cloudist AB | SE | — | — |
| 194.103.133.0/24 | 256 |
0.0%
|
Cloudist AB | SE | — | — |
| 194.103.192.0/24 | 256 |
0.0%
|
Cloudist AB | SE | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS51821 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 |
|---|---|---|
| 91.216.62.0/24 | 7,425 | 2026-08-02 23:09:03 |
| 194.103.133.0/24 | 7,100 | 2026-08-02 23:09:35 |
| 194.103.198.0/23 | 6,998 | 2026-08-02 23:09:35 |
| 193.234.102.0/23 | 6,841 | 2026-08-02 23:09:35 |
| 192.176.243.0/24 | 6,498 | 2026-08-02 23:10:21 |
| 194.103.192.0/24 | 6,450 | 2026-08-02 23:10:52 |
Frequently Asked Questions
What is AS51821?
AS51821 is an Autonomous System Number assigned to Cloudist AB. 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 AS51821 announce?
AS51821 announces 2.0K IPv4 addresses distributed across 6 routed CIDR prefixes. The network is registered in Sweden.
Who operates AS51821?
AS51821 is operated by Cloudist AB. The organization is based in Sweden. You can view all IP ranges and related ASNs on the organization page.
What country is AS51821 registered in?
AS51821 is registered in Sweden. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
