AS2857
Johannes Gutenberg-Universitaet Mainz
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
- Academic allocation +6
- Trust score 71 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
Network profile
Source: PeeringDB →Present at 2 internet exchanges: DE-CIX Frankfurt: DE-CIX Frankfurt Peering LAN, MegaIX Frankfurt
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 134.93.0.0/16 | 65.5K |
55.4%
|
Johannes Gutenberg-Universitaet Mainz | DE | Rheinland-Pfalz | Mainz |
| 136.199.0.0/16 | 65.5K |
43.7%
|
Johannes Gutenberg-Universitaet Mainz | DE | Rheinland-Pfalz | Trier |
| 139.14.0.0/16 | 65.5K |
0.0%
|
Johannes Gutenberg-Universitaet Mainz | DE | Rheinland-Pfalz | Landau |
| 141.26.0.0/16 | 65.5K |
6.5%
|
Johannes Gutenberg-Universitaet Mainz | DE | Rheinland-Pfalz | Koblenz |
| 143.93.0.0/16 | 65.5K |
20.6%
|
Johannes Gutenberg-Universitaet Mainz | DE | Rheinland-Pfalz | Hoppstädten-Weiersbach |
| 217.198.240.0/20 | 4.1K |
15.0%
|
Johannes Gutenberg-Universitaet Mainz | DE | Rheinland-Pfalz | Oppenheim |
| 192.67.218.0/24 | 256 |
8.6%
|
Johannes Gutenberg-Universitaet Mainz | DE | Rheinland-Pfalz | Mainz |
| 192.124.238.0/24 | 256 |
10.2%
|
Johannes Gutenberg-Universitaet Mainz | DE | — | — |
| 193.30.18.0/24 | 256 |
23.0%
|
Johannes Gutenberg-Universitaet Mainz | DE | — | — |
| 193.43.29.0/24 | 256 |
1.2%
|
Johannes Gutenberg-Universitaet Mainz | DE | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS2857 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 |
|---|---|---|
| 193.43.29.0/24 | 4,829 | 2026-07-22 02:04:07 |
| 217.198.240.0/20 | 4,798 | 2026-07-22 02:04:07 |
| 143.93.0.0/16 | 4,798 | 2026-07-22 02:04:07 |
| 141.26.0.0/16 | 4,796 | 2026-07-22 02:04:07 |
| 192.124.238.0/24 | 4,788 | 2026-07-22 02:04:07 |
| 139.14.0.0/16 | 4,780 | 2026-07-22 02:04:07 |
| 136.199.0.0/16 | 4,772 | 2026-07-22 02:04:07 |
| 193.30.18.0/24 | 4,748 | 2026-07-22 02:04:07 |
| 192.67.218.0/24 | 4,736 | 2026-07-22 02:04:07 |
| 134.93.0.0/16 | 4,619 | 2026-07-22 02:04:07 |
Frequently Asked Questions
What is AS2857?
AS2857 is an Autonomous System Number assigned to Johannes Gutenberg-Universitaet Mainz. 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 AS2857 announce?
AS2857 announces 332.8K IPv4 addresses distributed across 10 routed CIDR prefixes. The network is registered in Germany.
Who operates AS2857?
AS2857 is operated by Johannes Gutenberg-Universitaet Mainz. The organization is based in Germany. You can view all IP ranges and related ASNs on the organization page.
What country is AS2857 registered in?
AS2857 is registered in Germany. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
