CIDR Range
101.5.128.0/21
Addresses
2,048
2.0K
Sub-ranges
0+
within this block
PTR Density
0.0%
0 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.
65/100
Moderate
How this score is built
- Baseline (neutral) 65
- Multiple-origin (MOAS) routing anomaly −12
- Academic allocation +6
- Long-established allocation (16y) +6
- Trust score 65 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Geolocation
First 256 of 2,048 IP addresses in 101.5.128.0/21
101.5.128.0
101.5.128.1
101.5.128.2
101.5.128.3
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101.5.128.254
101.5.128.255
+ 1.8K more (range too large to list inline)
BGP Routing
Live BGP anomalies →This block is announced in BGP, observed across our RIPE RIS collectors.
Announced prefix
Announcement samples
3,826
Last seen
2026-07-23 19:50:45
Origins seen: AS4538 · 3,826 AS24348 · 1,068
Frequently Asked Questions
What is 101.5.128.0/21?
101.5.128.0/21 is a CIDR network block containing 2,048 IPv4 addresses (from 101.5.128.0 to 101.5.135.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.
Who owns the 101.5.128.0/21 network?
The 101.5.128.0/21 range is allocated to China Education and Research Network Center and announced via AS4538 from China.
Last updated: 2026-07-23 19:55:31 UTC
