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
- Multiple-origin (MOAS) routing anomaly −12
- Trust score 53 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
⚠ 1 MOAS prefix — multiple origin ASNs detected
All MOAS anomalies →A previously stable prefix originated by AS21234 is now also announced by another ASN (MOAS — Multiple-Origin AS), detected from our RIPE RIS collectors. Often benign (anycast, multi-homing, or a recent transfer) — but it can signal a route leak or prefix hijack, so it's worth inspecting.
| Prefix | Origin ASNs | Last detected (UTC) |
|---|---|---|
| 217.25.138.0/24 | AS21234, AS209891 | 2026-08-01 07:39:59 |
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 217.25.128.0/21 | 2.0K |
0.0%
|
GRENKE Service GmbH | DE | — | — |
| 217.25.140.0/22 | 1.0K |
0.0%
|
GRENKE Service GmbH | DE | — | — |
| 217.25.136.0/24 | 256 |
0.0%
|
GRENKE Service GmbH | DE | — | — |
| 217.25.139.0/24 | 256 |
0.0%
|
GRENKE Service GmbH | DE | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS21234 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 |
|---|---|---|
| 217.25.128.0/20 | 7,509 | 2026-08-02 01:16:44 |
| 217.25.138.0/24 | 473 | 2026-08-02 01:15:28 |
Frequently Asked Questions
What is AS21234?
AS21234 is an Autonomous System Number assigned to GRENKE Service 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 AS21234 announce?
AS21234 announces 3.6K IPv4 addresses distributed across 4 routed CIDR prefixes. The network is registered in Germany.
Who operates AS21234?
AS21234 is operated by GRENKE Service GmbH. The organization is based in Germany. You can view all IP ranges and related ASNs on the organization page.
What country is AS21234 registered in?
AS21234 is registered in Germany. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
