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CIDR Range

137.104.64.0/19

Addresses
8,192
8.2K
Sub-ranges
0+
within this block
PTR Density
37.9%
3.1K of 8.2K 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.

82/100
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 137.104.64.0/19

137.104.64.0/19 runs from 137.104.64.0 to 137.104.95.255.

First 16
Last 16

Not announced as an exact prefix — covered by the announced supernet 137.104.0.0/16.

Announced prefix
Origin AS
Announcement samples
33,215
Last seen
2026-11-06 14:51:13

Frequently Asked Questions

What is 137.104.64.0/19?

137.104.64.0/19 is a CIDR network block containing 8,192 IPv4 addresses (from 137.104.64.0 to 137.104.95.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 137.104.64.0/19 network?

The 137.104.64.0/19 range is allocated to University of Wisconsin System and announced via AS3128 from United States.

Last updated: 2026-11-06 15:09:06 UTC
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