Anomaly
https://ultrasurf.us/
HTTP blocking (HTTP requests failed)
Websites
Runtime: 20.6s
On September 16, 2025, 04:12 PM UTC, https://ultrasurf.us/ presented signs of HTTP blocking (HTTP requests failed) on 9871 in South Korea.
This might mean that https://ultrasurf.us/ was blocked, but false positives can occur.
Please explore the network measurement data below.
Failures
HTTP Experiment
generic_timeout_error
DNS Experiment
null
Control
null
DNS Queries
Resolver:
172.253.6.150
Query:
IN A ultrasurf.us
Engine:
system
Name
Class
TTL
Type
DATA
@
IN
A
104.21.62.172
@
IN
A
172.67.137.144
Query:
IN AAAA ultrasurf.us
Engine:
system
Name
Class
TTL
Type
DATA
@
IN
AAAA
2606:4700:3035::6815:3eac
@
IN
AAAA
2606:4700:3032::ac43:8990
TCP Connections
Connection to 2606:4700:3032::ac43:8990:443 was blocked.
Connection to 2606:4700:3035::6815:3eac:443 was blocked.
Connection to 104.21.62.172:443 succeeded.
Connection to 172.67.137.144:443 succeeded.
HTTP Requests
No Data
Resolver
Resolver ASN
AS15169
Resolver IP
172.253.6.150
Resolver Network Name
Google LLC
Report ID
20250916T160956Z_webconnectivity_KR_9871_n4_gTR9eoPtqgVUr32N
Platform
android
Software Name
ooniprobe-android-unattended (5.1.0)
Measurement Engine
ooniprobe-engine (3.26.0)