CIDR Range

1.52.128.0/20

4.1K IPs /20 FPT Telecom Company AS18403 Vietnam APNIC

Addresses

4,096

4.1K

IP Range

1.52.128.0

→ 1.52.143.255

Sub-ranges

within this block

PTR Density

0.1%

3 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.

81/100

Trusted

How this score is built

Baseline (neutral) 65
Long-established allocation (16y) +6
Has a reverse-DNS (PTR) record +5
Isp allocation +5
Trust score 81 / 100

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

Geolocation

First and last addresses in 1.52.128.0/20

1.52.128.0/20 runs from 1.52.128.0 to 1.52.143.255.

First 16

1.52.128.0 1.52.128.1 1.52.128.2 1.52.128.3 1.52.128.4 1.52.128.5 1.52.128.6 1.52.128.7 1.52.128.8 1.52.128.9 1.52.128.10 1.52.128.11 1.52.128.12 1.52.128.13 1.52.128.14 1.52.128.15

Last 16

1.52.143.240 1.52.143.241 1.52.143.242 1.52.143.243 1.52.143.244 1.52.143.245 1.52.143.246 1.52.143.247 1.52.143.248 1.52.143.249 1.52.143.250 1.52.143.251 1.52.143.252 1.52.143.253 1.52.143.254 1.52.143.255

BGP Routing

Live BGP anomalies →

Not announced as an exact prefix — covered by the announced supernet 1.52.128.0/18.

Announced prefix

1.52.128.0/18

Origin AS

AS18403

Announcement samples

39,204

Last seen

2026-10-31 03:38:03

Frequently Asked Questions

What is 1.52.128.0/20?

1.52.128.0/20 is a CIDR network block containing 4,096 IPv4 addresses (from 1.52.128.0 to 1.52.143.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 1.52.128.0/20 network?

The 1.52.128.0/20 range is allocated to FPT Telecom Company and announced via AS18403 from Vietnam.

Last updated: 2026-10-31 04:09:05 UTC