Addresses
32,768
32.8K
Sub-ranges
8+
within this block
PTR Density
100.0%
32.8K of 32.8K IPs have PTR
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.
73/100
Moderate
How this score is built
- Baseline (neutral) 65
- Has a reverse-DNS (PTR) record +5
- Established allocation (14y) +3
- Trust score 73 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Ranges inside 37.183.0.0/17
| CIDR | IPs | Organization | ASN | Country |
|---|---|---|---|---|
| 37.183.0.0/20 | 4.1K | Fastweb | AS30722 | IT |
| 37.183.16.0/20 | 4.1K | Fastweb | AS30722 | IT |
| 37.183.32.0/20 | 4.1K | Fastweb | AS30722 | IT |
| 37.183.48.0/20 | 4.1K | Fastweb | AS30722 | IT |
| 37.183.64.0/20 | 4.1K | Fastweb | AS30722 | IT |
| 37.183.80.0/20 | 4.1K | Fastweb | AS30722 | IT |
| 37.183.96.0/20 | 4.1K | Fastweb | AS30722 | IT |
| 37.183.112.0/20 | 4.1K | Fastweb | AS30722 | IT |
Geolocation
First 256 of 32,768 IP addresses in 37.183.0.0/17
37.183.0.0
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+ 32.5K more (range too large to list inline)
BGP Routing
Live BGP anomalies →Not announced as an exact prefix — covered by the announced supernet 37.176.0.0/13.
Announced prefix
Origin AS
Announcement samples
3,911
Last seen
2026-07-24 11:18:21
Frequently Asked Questions
What is 37.183.0.0/17?
37.183.0.0/17 is a CIDR network block containing 32,768 IPv4 addresses (from 37.183.0.0 to 37.183.127.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.
Who owns the 37.183.0.0/17 network?
The 37.183.0.0/17 range is allocated to Fastweb and announced via AS30722 from Italy.
Last updated: 2026-07-24 12:10:32 UTC
