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
- Enterprise allocation +4
- Trust score 69 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Network profile
Source: PeeringDB →Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 159.100.24.0/22 | 1.0K |
23.2%
|
firstcolo GmbH | DE | — | — |
| 79.133.32.0/23 | 512 |
8.6%
|
firstcolo GmbH | DE | — | — |
| 159.100.26.0/23 | 512 |
0.0%
|
firstcolo GmbH | DE | — | — |
| 5.187.28.0/24 | 256 |
0.0%
|
firstcolo GmbH | GB | — | — |
| 79.133.43.0/24 | 256 |
64.8%
|
firstcolo GmbH | DE | — | — |
| 109.169.80.0/24 | 256 |
0.0%
|
firstcolo GmbH | GB | — | — |
| 159.100.24.0/24 | 256 |
0.0%
|
firstcolo GmbH | AT | — | — |
| 168.81.255.0/24 | 256 |
0.0%
|
firstcolo GmbH | SC | — | — |
| 196.18.175.0/24 | 256 |
0.0%
|
firstcolo GmbH | SC | — | — |
| 159.100.25.128/25 | 128 |
0.0%
|
firstcolo GmbH | AT | — | — |
| 159.100.25.64/26 | 64 |
0.0%
|
firstcolo GmbH | AT | — | — |
| 159.100.25.0/27 | 32 |
0.0%
|
firstcolo GmbH | AT | — | — |
| 159.100.25.48/28 | 16 |
0.0%
|
firstcolo GmbH | DE | — | — |
| 159.100.25.32/29 | 8 |
0.0%
|
firstcolo GmbH | DE | — | — |
| 159.100.25.40/30 | 4 |
0.0%
|
firstcolo GmbH | DE | — | — |
| 159.100.25.44/30 | 4 |
0.0%
|
firstcolo GmbH | AT | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS203833 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 |
|---|---|---|
| 79.133.43.0/24 | 334,532 | 2026-07-24 00:02:18 |
| 5.187.28.0/24 | 332,538 | 2026-07-24 00:01:46 |
| 109.169.80.0/24 | 332,288 | 2026-07-24 00:01:46 |
| 196.18.175.0/24 | 282,960 | 2026-07-24 00:01:46 |
| 168.81.255.0/24 | 282,855 | 2026-07-24 00:01:46 |
| 79.133.32.0/23 | 4,407 | 2026-07-24 00:03:48 |
| 159.100.24.0/22 | 4,327 | 2026-07-24 00:01:46 |
Frequently Asked Questions
What is AS203833?
AS203833 is an Autonomous System Number assigned to firstcolo GmbH. 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 AS203833 announce?
AS203833 announces 2.8K IPv4 addresses distributed across 7 routed CIDR prefixes. The network is registered in Austria.
Who operates AS203833?
AS203833 is operated by firstcolo GmbH. The organization is based in Austria. You can view all IP ranges and related ASNs on the organization page.
What country is AS203833 registered in?
AS203833 is registered in Austria. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
