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CIDR Range

4.43.104.0/21

2.0K IPs /21 Level 3 Parent, LLC AS3356 United States ARIN
Addresses
2,048
2.0K
IP Range
4.43.104.0
→ 4.43.111.255
Sub-ranges
0+
within this block
PTR Density
3.1%
64 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.

81/100
Trusted
How this score is built

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

Geolocation

First and last addresses in 4.43.104.0/21

4.43.104.0/21 runs from 4.43.104.0 to 4.43.111.255.

First 16
4.43.104.0 4.43.104.1 4.43.104.2 4.43.104.3 4.43.104.4 4.43.104.5 4.43.104.6 4.43.104.7 4.43.104.8 4.43.104.9 4.43.104.10 4.43.104.11 4.43.104.12 4.43.104.13 4.43.104.14 4.43.104.15
Last 16
4.43.111.240 4.43.111.241 4.43.111.242 4.43.111.243 4.43.111.244 4.43.111.245 4.43.111.246 4.43.111.247 4.43.111.248 4.43.111.249 4.43.111.250 4.43.111.251 4.43.111.252 4.43.111.253 4.43.111.254 4.43.111.255

BGP Routing

Live BGP anomalies →

Not announced as an exact prefix — covered by the announced supernet 4.0.0.0/10.

Announced prefix
4.0.0.0/10
Origin AS
AS198474
Announcement samples
97
Last seen
2026-09-10 15:53:43

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 — US

Frequently Asked Questions

What is 4.43.104.0/21?

4.43.104.0/21 is a CIDR network block containing 2,048 IPv4 addresses (from 4.43.104.0 to 4.43.111.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 4.43.104.0/21 network?

The 4.43.104.0/21 range is allocated to Level 3 Parent, LLC and announced via AS3356 from United States.

Last updated: 2026-11-12 05:54:05 UTC
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