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CIDR Range

133.197.0.0/16

Addresses
65,536
65.5K
Sub-ranges
0+
within this block
PTR Density
0.0%
0 of 65.5K 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

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

Geolocation

First and last addresses in 133.197.0.0/16

133.197.0.0/16 runs from 133.197.0.0 to 133.197.255.255.

First 16
Last 16

This block is announced in BGP, observed across our RIPE RIS collectors.

Announced prefix
Origin AS
Announcement samples
1,990
Last seen
2026-10-27 11:07:11

Frequently Asked Questions

What is 133.197.0.0/16?

133.197.0.0/16 is a CIDR network block containing 65,536 IPv4 addresses (from 133.197.0.0 to 133.197.255.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 133.197.0.0/16 network?

The 133.197.0.0/16 range is allocated to NTT America, Inc. and announced via AS2914 from Japan.

Last updated: 2026-10-27 11:54:05 UTC
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