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
- Long-established allocation (26y) +6
- Has a reverse-DNS (PTR) record +5
- Trust score 76 / 100
Experimental · trust-vectors model v1.3.0 — a transparent heuristic, not a definitive verdict. How it works →
Ranges inside 172.173.0.0/16
| CIDR | IPs | Organization | ASN | Country |
|---|---|---|---|---|
| 172.173.64.0/18 | 16.4K | Microsoft Corporation | AS8075 | GB |
| 172.173.192.0/18 | 16.4K | Microsoft Corporation | AS8075 | GB |
| 172.173.32.0/19 | 8.2K | Microsoft Corporation | AS8075 | GB |
| 172.173.160.0/19 | 8.2K | Microsoft Corporation | AS8075 | GB |
| 172.173.16.0/20 | 4.1K | Microsoft Corporation | AS8075 | GB |
| 172.173.128.0/20 | 4.1K | Microsoft Corporation | AS8075 | GB |
| 172.173.144.0/20 | 4.1K | Microsoft Corporation | AS8075 | GB |
| 172.173.0.0/21 | 2.0K | Microsoft Corporation | AS8075 | GB |
| 172.173.8.0/21 | 2.0K | Microsoft Corporation | AS8075 | GB |
First and last addresses in 172.173.0.0/16
172.173.0.0/16 runs from 172.173.0.0 to 172.173.255.255.
BGP Routing
Live BGP anomalies →Not announced as an exact prefix — covered by the announced supernet 172.160.0.0/11.
RIR Ownership History
Atom feed ⇲Allocation changes captured from regional internet registry (RIR) delegation files, re-imported every six hours.
| Date | Event | From | To |
|---|---|---|---|
| 2026-05-10 | New Allocation | — | GB |
Frequently Asked Questions
What is 172.173.0.0/16?
172.173.0.0/16 is a CIDR network block containing 65,536 IPv4 addresses (from 172.173.0.0 to 172.173.255.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.
Who owns the 172.173.0.0/16 network?
The 172.173.0.0/16 range is allocated to Microsoft Corporation and announced via AS8075 from United States.
