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 →
⚠ 3 MOAS prefixes — multiple origin ASNs detected
All MOAS anomalies →A previously stable prefix originated by AS203993 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) |
|---|---|---|
| 67.221.252.0/24 | AS8038, AS203993 | 2026-07-24 15:53:49 |
| 67.221.253.0/24 | AS8038, AS203993 | 2026-07-24 15:53:49 |
| 67.221.255.0/24 | AS8038, AS203993 | 2026-07-24 15:53:49 |
Network profile
Source: PeeringDB →Present at 1 internet exchange: Speed-IX: SPEED-IX
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 185.54.92.0/23 | 512 |
27.1%
|
S.J.M. Steffann | NL | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS203993 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 |
|---|---|---|
| 185.54.92.0/23 | 19,844 | 2026-07-24 15:47:16 |
| 67.221.252.0/24 | 14,834 | 2026-07-24 15:47:09 |
| 185.54.93.0/24 | 7,603 | 2026-07-13 06:46:18 |
| 185.54.92.0/24 | 7,594 | 2026-07-13 06:46:18 |
| 67.221.253.0/24 | 3,665 | 2026-07-24 15:47:09 |
| 67.221.255.0/24 | 3,498 | 2026-07-24 15:47:09 |
Frequently Asked Questions
What is AS203993?
AS203993 is an Autonomous System Number assigned to S.J.M. Steffann. 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 AS203993 announce?
AS203993 announces 512 IPv4 addresses distributed across 1 routed CIDR prefixes. The network is registered in The Netherlands.
Who operates AS203993?
AS203993 is operated by S.J.M. Steffann. The organization is based in The Netherlands. You can view all IP ranges and related ASNs on the organization page.
What country is AS203993 registered in?
AS203993 is registered in The Netherlands. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
