Addresses
2,048
2.0K
Sub-ranges
0+
within this block
PTR Density
0.0%
0 of 2.0K 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.
71/100
Moderate
How this score is built
- Baseline (neutral) 65
- Long-established allocation (25y) +6
- Trust score 71 / 100
Experimental · trust-vectors model v1.3.0 — a transparent heuristic, not a definitive verdict. How it works →
Geolocation
First and last addresses in 217.133.0.0/21
217.133.0.0/21 runs from 217.133.0.0 to 217.133.7.255.
First 16
217.133.0.0
217.133.0.1
217.133.0.2
217.133.0.3
217.133.0.4
217.133.0.5
217.133.0.6
217.133.0.7
217.133.0.8
217.133.0.9
217.133.0.10
217.133.0.11
217.133.0.12
217.133.0.13
217.133.0.14
217.133.0.15
Last 16
Frequently Asked Questions
What is 217.133.0.0/21?
217.133.0.0/21 is a CIDR network block containing 2,048 IPv4 addresses (from 217.133.0.0 to 217.133.7.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.
Who owns the 217.133.0.0/21 network?
The 217.133.0.0/21 range is allocated to Open Fiber S.P.A. and announced via AS210218 from Italy.
Last updated: 2026-11-14 06:24:05 UTC
