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ASN REPORT — AS21928 · T-Mobile USA, Inc.

First sighted: July 16, 2023, 3 a.m. · Last sighted: Jan. 11, 2026, 1:59 a.m.

Risk
18 (low)
Total hits
19296
Total errors
1862
Observed IPs
2428
Top country
N/A
Top city
N/A

Risk

Model: v1 Computed: 2026-01-18 11:55:13
Risk score
18
Low
Risk gradient
Key drivers are enriched against the published annotator catalog when available; otherwise sensible defaults are used.
Key drivers
Request size anomaly
Requests are unusually large or shaped in a way that suggests abuse or automation.
request_size
Hits 1453
Points 224.11
Scan velocity
High request rate and broad endpoint coverage suggest scanning or automated enumeration.
scan_velocity
Hits 194
Points 124.24
User-Agent anomaly
User-Agent signals look missing, inconsistent, or indicative of non-browser tooling.
ua
Hits 1132
Points 82.66
Credential brute forcing
Repeated authentication attempts consistent with password guessing or credential stuffing.
cred
Hits 13
Points 37.29
Automated client behavior
Traffic patterns strongly suggest automation rather than a human-operated browser.
bot
Hits 31
Points 14.72
Protocol anomaly
Request structure or protocol-level signals deviate from typical browser HTTP traffic.
proto
Hits 4
Points 1.98
Referrer abuse
Referrer patterns look manipulated, irrelevant, or inconsistent with normal navigation.
ref
Hits 1
Points 0.13

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
12925
3xx
247
4xx
828
5xx
1034
Unique URLs
6570
Total hits
19296
First seen
July 16, 2023, 3 a.m.
Last seen
Jan. 11, 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
Request size anomaly request_size
Requests are unusually large or shaped in a way that suggests abuse or automation.
hits 1453 pts 224.11
Breakdown by severity band (all-time). “Weighted” reflects your weight configuration.
Severity Total Labels Weighted First seen Last seen Top labels
12 470 1 219.96 Nov. 14, 2024, 10:05 p.m. Nov. 6, 2025, 7:21 a.m.
request_size 470
14 4 1 2.35 May 28, 2025, 3:47 p.m. May 30, 2025, 9:09 a.m.
request_size 4
20 2 1 1.80 Feb. 24, 2025, 2:38 a.m. Feb. 24, 2025, 2:38 a.m.
request_size 2
0 977 1 0.00 Dec. 26, 2024, 12:57 a.m. Nov. 6, 2025, noon
request_size 977
Scan velocity scan_velocity
High request rate and broad endpoint coverage suggest scanning or automated enumeration.
hits 194 pts 124.24
Breakdown by severity band (all-time). “Weighted” reflects your weight configuration.
Severity Total Labels Weighted First seen Last seen Top labels
10 92 1 115.92 Oct. 1, 2024, midnight Aug. 16, 2025, 11:02 p.m.
scan_velocity 92
12 3 1 4.54 Feb. 14, 2025, 12:01 a.m. April 16, 2025, 7:55 p.m.
scan_velocity 3
16 1 1 2.02 Feb. 14, 2025, 12:01 a.m. Feb. 14, 2025, 12:01 a.m.
scan_velocity 1
14 1 1 1.76 Feb. 14, 2025, 12:01 a.m. Feb. 14, 2025, 12:01 a.m.
scan_velocity 1
0 97 1 0.00 Oct. 1, 2024, midnight Aug. 16, 2025, 11:02 p.m.
scan_velocity 97
User-Agent anomaly ua
User-Agent signals look missing, inconsistent, or indicative of non-browser tooling.
hits 1132 pts 82.66
Breakdown by severity band (all-time). “Weighted” reflects your weight configuration.
Severity Total Labels Weighted First seen Last seen Top labels
6 1116 1 80.35 Sept. 25, 2023, 3:36 a.m. Dec. 21, 2025, 11:05 p.m.
ua 1116
10 16 1 2.30 Nov. 7, 2024, 6:35 a.m. Nov. 7, 2024, 11:44 a.m.
ua 16
Credential brute forcing cred
Repeated authentication attempts consistent with password guessing or credential stuffing.
hits 13 pts 37.29
Breakdown by severity band (all-time). “Weighted” reflects your weight configuration.
Severity Total Labels Weighted First seen Last seen Top labels
10 5 1 19.36 Dec. 7, 2024, 10:12 a.m. March 25, 2025, 2:21 a.m.
cred 5
12 3 1 14.85 Dec. 7, 2024, 10:12 a.m. Dec. 7, 2024, 10:12 a.m.
cred 3
8 1 1 3.08 March 25, 2025, 2:21 a.m. March 25, 2025, 2:21 a.m.
cred 1
0 4 1 0.00 Dec. 7, 2024, 10:12 a.m. March 25, 2025, 2:21 a.m.
cred 4
Automated client behavior bot
Traffic patterns strongly suggest automation rather than a human-operated browser.
hits 31 pts 14.72
Breakdown by severity band (all-time). “Weighted” reflects your weight configuration.
Severity Total Labels Weighted First seen Last seen Top labels
10 31 1 14.72 Jan. 5, 2024, 2:45 a.m. Nov. 6, 2025, 7:21 a.m.
bot 31
Protocol anomaly proto
Request structure or protocol-level signals deviate from typical browser HTTP traffic.
hits 4 pts 1.98
Breakdown by severity band (all-time). “Weighted” reflects your weight configuration.
Severity Total Labels Weighted First seen Last seen Top labels
11 3 1 1.85 May 6, 2025, 12:33 a.m. Dec. 21, 2025, 11:05 p.m.
proto 3
3 1 1 0.13 Dec. 21, 2025, 11:05 p.m. Dec. 21, 2025, 11:05 p.m.
proto 1
Referrer abuse ref
Referrer patterns look manipulated, irrelevant, or inconsistent with normal navigation.
hits 1 pts 0.13
Breakdown by severity band (all-time). “Weighted” reflects your weight configuration.
Severity Total Labels Weighted First seen Last seen Top labels
6 1 1 0.13 March 25, 2025, 2:21 a.m. March 25, 2025, 2:21 a.m.
ref 1

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.