CIDR Range

42.200.40.0/21

2.0K IPs /21 Hong Kong APNIC

Addresses

2,048

2.0K

IP Range

42.200.40.0

→ 42.200.47.255

Sub-ranges

10+

within this block

PTR Density

100.0%

2.0K 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 (15y) +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 42.200.40.0/21

CIDR	IPs	Organization	ASN	Country
42.200.46.0/23	512	HKT Limited	AS4760	HK
42.200.46.0/23	512	HKT Limited	AS4760	HK
42.200.44.0/23	512	PCCW IMS Ltd PCCW Business Internet Access	AS4515	HK
42.200.44.0/23	512	PCCW IMS Ltd PCCW Business Internet Access	AS4515	HK
42.200.42.0/23	512	PCCW IMS Ltd PCCW Business Internet Access	AS4515	HK
42.200.42.0/23	512	PCCW IMS Ltd PCCW Business Internet Access	AS4515	HK
42.200.41.0/24	256	PCCW IMS Ltd PCCW Business Internet Access	AS4515	HK
42.200.41.0/24	256	PCCW IMS Ltd PCCW Business Internet Access	AS4515	HK
42.200.40.0/24	256	HKT Limited	AS4760	HK
42.200.40.0/24	256	HKT Limited	AS4760	HK

Geolocation

First and last addresses in 42.200.40.0/21

42.200.40.0/21 runs from 42.200.40.0 to 42.200.47.255.

First 16

42.200.40.0 42.200.40.1 42.200.40.2 42.200.40.3 42.200.40.4 42.200.40.5 42.200.40.6 42.200.40.7 42.200.40.8 42.200.40.9 42.200.40.10 42.200.40.11 42.200.40.12 42.200.40.13 42.200.40.14 42.200.40.15

Last 16

42.200.47.240 42.200.47.241 42.200.47.242 42.200.47.243 42.200.47.244 42.200.47.245 42.200.47.246 42.200.47.247 42.200.47.248 42.200.47.249 42.200.47.250 42.200.47.251 42.200.47.252 42.200.47.253 42.200.47.254 42.200.47.255

BGP Routing

Live BGP anomalies →

Not announced as an exact prefix — covered by the announced supernet 42.200.32.0/19.

Announced prefix

42.200.32.0/19

Origin AS

AS4515

Announcement samples

24,163

Last seen

2026-11-01 04:59:26

Frequently Asked Questions

What is 42.200.40.0/21?

42.200.40.0/21 is a CIDR network block containing 2,048 IPv4 addresses (from 42.200.40.0 to 42.200.47.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 42.200.40.0/21 network?

The 42.200.40.0/21 range is allocated to an unknown organization from Hong Kong.

Last updated: 2026-11-01 05:09:05 UTC