CIDR Range

38.86.72.0/21

2.0K IPs /21 United States ARIN

Addresses

2,048

2.0K

IP Range

38.86.72.0

→ 38.86.79.255

Sub-ranges

23+

within this block

PTR Density

2.9%

59 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.

76/100

Moderate

How this score is built

Baseline (neutral) 65
Long-established allocation (35y) +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 38.86.72.0/21

CIDR	IPs	Organization	ASN	Country
38.86.72.0/22	1.0K	Cogent Communications, LLC	AS174	US
38.86.78.0/23	512	—	—	US
38.86.74.0/23	512	—	—	US
38.86.76.0/23	512	—	—	US
38.86.74.0/23	512	AS25920	AS25920	US
38.86.78.0/23	512	Cogent Communications, LLC	AS174	US
38.86.78.0/23	512	Cogent Communications, LLC	AS174	US
38.86.72.0/23	512	Cogent Communications, LLC	AS174	US
38.86.77.0/24	256	Cogent Communications, LLC	AS174	US
38.86.76.0/24	256	N2N Technologies, Inc.	AS40604	US
38.86.76.0/24	256	N2N Technologies, Inc.	AS40604	US
38.86.77.0/24	256	E K Computer, Inc.	AS400431	US
38.86.72.128/25	128	—	—	US
38.86.73.192/26	64	—	—	US
38.86.72.0/26	64	—	—	US
38.86.72.64/26	64	—	—	US
38.86.73.64/26	64	—	—	US
38.86.73.32/27	32	—	—	US
38.86.73.128/27	32	—	—	US
38.86.73.16/28	16	—	—	US
38.86.73.0/28	16	—	—	US
38.86.73.160/28	16	—	—	US
38.86.73.176/28	16	—	—	US

First and last addresses in 38.86.72.0/21

38.86.72.0/21 runs from 38.86.72.0 to 38.86.79.255.

First 16

38.86.72.0 38.86.72.1 38.86.72.2 38.86.72.3 38.86.72.4 38.86.72.5 38.86.72.6 38.86.72.7 38.86.72.8 38.86.72.9 38.86.72.10 38.86.72.11 38.86.72.12 38.86.72.13 38.86.72.14 38.86.72.15

Last 16

38.86.79.240 38.86.79.241 38.86.79.242 38.86.79.243 38.86.79.244 38.86.79.245 38.86.79.246 38.86.79.247 38.86.79.248 38.86.79.249 38.86.79.250 38.86.79.251 38.86.79.252 38.86.79.253 38.86.79.254 38.86.79.255

BGP Routing

Live BGP anomalies →

Not announced as an exact prefix — covered by the announced supernet 38.0.0.0/8.

Announced prefix

38.0.0.0/8

Origin AS

AS174

Announcement samples

17,462

Last seen

2026-11-10 18:16:13

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 38.86.72.0/21?

38.86.72.0/21 is a CIDR network block containing 2,048 IPv4 addresses (from 38.86.72.0 to 38.86.79.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 38.86.72.0/21 network?

The 38.86.72.0/21 range is allocated to an unknown organization from United States.

Last updated: 2026-11-10 18:24:06 UTC