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ASN Owner
DataCenterCERNET-CN
Company
DataCenterCERNET2 IX at University of Science and Technology of China. Loading...
ASN History
Network
AS Organization
Country
First Seen
Last Seen
121.251.16.0/21
DataCenterCERNET-CN
China
2012-01-25 23:19
2026-10-08 04:33
121.251.16.0/21
DataCenterCERNET2 IX at University of Science and Technology of China
China
2020-01-05 00:12
2026-09-15 10:56
Organization registration history
Network
Registered since
Verified / ended
No verified organization registration records
Registration History
Registry
Country
First Seen
Last Seen
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IP Location History
Location
Time
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Recent queries
Latest 20 per typeExplore recently queried IP addresses.
Open IP→Compare round-trip latency and packet loss from different locations.
Open PING→History opens saved results. Select “Run again” to start a new test.
Inspect route paths, hop addresses and response times from different locations.
Open Traceroute→History opens saved results. Select “Run again” to start a new test.
Compare DNS records, resolvers and response times across locations.
Open DNS→History opens saved results. Select “Run again” to start a new test.
Combine route tracing with repeated probes to inspect hop latency and loss. Intermediate hop rate limiting does not establish destination packet loss.
Open MTR→History opens saved results. Select “Run again” to start a new test.
Inspect HTTP status, response headers and request timings from different locations.
Open HTTP→History opens saved results. Select “Run again” to start a new test.
