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ASN REPORT — AS4538 · China Education and Research Network Center

First sighted: Sept. 7, 2023, 3 a.m. · Last sighted: Jan. 10, 2026, 1:59 a.m.

Risk
1 (low)
Total hits
476
Total errors
187
Observed IPs
29
Top country
N/A
Top city
N/A

Risk

Model: v1 Computed: 2026-01-18 11:55:04
Risk score
1
Low
Risk gradient
Key drivers are enriched against the published annotator catalog when available; otherwise sensible defaults are used.
Key drivers
User-Agent anomaly
User-Agent signals look missing, inconsistent, or indicative of non-browser tooling.
ua
Hits 166
Points 20.29
HTTP method anomaly
Unusual or unexpected HTTP methods observed for the target endpoints.
method
Hits 4
Points 2.21
Request size anomaly
Requests are unusually large or shaped in a way that suggests abuse or automation.
request_size
Hits 17
Points 0.47

Traffic

Rollup

Daily activity (hits per day) and basic HTTP rollup counters for this ASN.

Loading activity…
Daily activity (hits per day). Total in window: —.
Traffic rollup
HTTP status classes, URL diversity, and totals.
2xx
122
3xx
58
4xx
186
5xx
1
Unique URLs
171
Total hits
476
First seen
Sept. 7, 2023, 3 a.m.
Last seen
Jan. 10, 2026, 1:59 a.m.

Annotators (All-time)

Heatmap of annotator × severity. Darker cells mean more volume in that band. Tip: switch to Weighted points to see what drives impact (not just noise).

Severity →
Low High
User-Agent anomaly ua
User-Agent signals look missing, inconsistent, or indicative of non-browser tooling.
hits 166 pts 20.29
Breakdown by severity band (all-time). “Weighted” reflects your weight configuration.
Severity Total Labels Weighted First seen Last seen Top labels
10 114 1 16.42 Sept. 7, 2023, 10:28 p.m. Dec. 18, 2024, 8:44 a.m.
ua 114
6 48 1 3.46 Sept. 18, 2024, 6:32 p.m. May 26, 2025, 4:42 a.m.
ua 48
8 4 1 0.42 Sept. 21, 2024, 10:37 p.m. Dec. 18, 2024, 8:45 a.m.
ua 4
HTTP method anomaly method
Unusual or unexpected HTTP methods observed for the target endpoints.
hits 4 pts 2.21
Breakdown by severity band (all-time). “Weighted” reflects your weight configuration.
Severity Total Labels Weighted First seen Last seen Top labels
10 4 1 2.21 Sept. 21, 2024, 10:37 p.m. Dec. 18, 2024, 8:45 a.m.
method 4
Request size anomaly request_size
Requests are unusually large or shaped in a way that suggests abuse or automation.
hits 17 pts 0.47
Breakdown by severity band (all-time). “Weighted” reflects your weight configuration.
Severity Total Labels Weighted First seen Last seen Top labels
12 1 1 0.47 April 16, 2025, 6:25 a.m. April 16, 2025, 6:25 a.m.
request_size 1
0 16 1 0.00 Feb. 19, 2025, 8:56 a.m. May 26, 2025, 4:42 a.m.
request_size 16

HTTP Status Breakdown

Response mix grouped by status class (2xx/3xx/4xx/5xx). Auto-loads a single aggregation and renders a donut.

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Running one aggregation and rendering the chart.

Geolocation

Live geolocation and map tiles auto-load for this ASN snapshot (peer IPs with coordinates).

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SUBNETS HELD BY THIS ISP

Derived from ISP snapshot peers (Option A). Grouped into IPv4 /24 and IPv6 /48 by default.
IPv4
IPv6
Limit
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Interesting IPs

Top risky peers inside this ASN (latest snapshot). Sorted by risk score, then hits.

No peer rows available for this ASN snapshot.