CIDR Range

72.73.96.0/20

4.1K IPs /20 Fidium AS13977 United States ARIN

Addresses

4,096

4.1K

IP Range

72.73.96.0

→ 72.73.111.255

Sub-ranges

13+

within this block

PTR Density

99.0%

4.1K of 4.1K 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.

80/100

Trusted

How this score is built

Baseline (neutral) 65
Long-established allocation (21y) +6
Has a reverse-DNS (PTR) record +5
Enterprise allocation +4
Trust score 80 / 100

Experimental · trust-vectors model v1.3.0 — a transparent heuristic, not a definitive verdict. How it works →

Ranges inside 72.73.96.0/20

CIDR	IPs	Organization	ASN	Country
72.73.96.0/21	2.0K	Fidium	AS13977	US
72.73.108.0/22	1.0K	Fidium	AS13977	US
72.73.106.0/23	512	Fidium	AS13977	US
72.73.104.0/24	256	Fidium	AS13977	US
72.73.105.0/25	128	Fidium	AS13977	US
72.73.105.192/26	64	Fidium	AS13977	US
72.73.105.160/27	32	Fidium	AS13977	US
72.73.105.144/28	16	Fidium	AS13977	US
72.73.105.136/29	8	Fidium	AS13977	US
72.73.105.132/30	4	Fidium	AS13977	US
72.73.105.130/31	2	Fidium	AS13977	US
72.73.105.129/32	1	Fidium	AS13977	US
72.73.105.128/32	1	Fidium	AS13977	US

First and last addresses in 72.73.96.0/20

72.73.96.0/20 runs from 72.73.96.0 to 72.73.111.255.

First 16

72.73.96.0 72.73.96.1 72.73.96.2 72.73.96.3 72.73.96.4 72.73.96.5 72.73.96.6 72.73.96.7 72.73.96.8 72.73.96.9 72.73.96.10 72.73.96.11 72.73.96.12 72.73.96.13 72.73.96.14 72.73.96.15

Last 16

72.73.111.240 72.73.111.241 72.73.111.242 72.73.111.243 72.73.111.244 72.73.111.245 72.73.111.246 72.73.111.247 72.73.111.248 72.73.111.249 72.73.111.250 72.73.111.251 72.73.111.252 72.73.111.253 72.73.111.254 72.73.111.255

RIR Ownership History

Atom feed ⇲

Allocation changes captured from regional internet registry (RIR) delegation files, re-imported every six hours.

Date	Event	From	To	RIR
2026-05-10	New Allocation	—	US	arin

Frequently Asked Questions

What is 72.73.96.0/20?

72.73.96.0/20 is a CIDR network block containing 4,096 IPv4 addresses (from 72.73.96.0 to 72.73.111.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 72.73.96.0/20 network?

The 72.73.96.0/20 range is allocated to Fidium and announced via AS13977 from United States.

Last updated: 2026-11-13 21:39:04 UTC