Session Report
Test run at: 2022-02-21 01:48:33 GMT
Client Prefix (v4): 202.99.16.x/24
Client AS (v4): 4808 (CHINA169-BJ)
IPv4 Probes: 60
Outbound spoofing summary (from the client to our server) Source address type IPv4 Private - RFC1918 unknown Routable unknown Largest spoofable neighbor prefix length none
Spoof status key received Spoofed packet was received. ✔ Pattern of tests from this IP block indicates a switch from allowing spoofing to blocking it. rewritten Spoofed packet was received, but the source address was changed en route. blocked Spoofed packet was not received, but unspoofed packet was. unknown Neither spoofed nor unspoofed packet was received.
Warnings:
- ⚠️ Your host was unable to source even non-spoofed IPv4 UDP traffic to our servers. A firewall, router or other middlebox is preventing our testing. To test your provider's network further, you must remove the firewall or router and connect directly.
IPv4 Adjacent Netblock Testing:
Your host (202.99.16.x/24) can spoof 0 neighboring addresses
Spoofed source address (anon) Prefix
LengthASN of spoofed
source addressReceived 202.99.16.x/24 /31 4808 natblock 202.99.16.x/24 /30 4808 natblock 202.99.16.x/24 /29 4808 natblock 202.99.16.x/24 /28 4808 natblock 202.99.16.x/24 /27 4808 natblock 202.99.16.x/24 /26 4808 natblock 202.99.16.x/24 /25 4808 natblock 202.99.16.x/24 /24 4808 natblock 202.99.17.x/24 /23 4808 natblock 202.99.18.x/24 /22 4808 natblock 202.99.20.x/24 /21 4808 natblock 202.99.24.x/24 /20 4808 natblock 202.99.0.x/24 /19 4808 natblock 202.99.48.x/24 /18 4808 natblock 202.99.80.x/24 /17 4837 natblock 202.99.144.x/24 /16 4837 natblock 202.98.16.x/24 /15 4837 natblock 202.97.16.x/24 /14 4134 natblock 202.103.16.x/24 /13 4134 natblock 202.107.16.x/24 /12 4837 natblock 202.115.16.x/24 /11 4538 natblock 202.67.16.x/24 /10 7522 natblock 202.35.16.x/24 /9 2516 natblock 202.227.16.x/24 /8 UNROUTED natblock Meaning of status in Received column:
natblock Spoofed probe packets appear to be blocked by your local NAT or firewall rather than being rewritten with a public source address.
IPv4 Outbound Filtering Depth:
The tracefilter test found your host unable to spoof routable, non-adjacent source addresses through even the first IP hop.Summary:
The results from all tests are aggregated to produce a summary "State of IP Spoofing" report.Feedback:
We welcome questions and feedback to the Spoofer Information Mailing List and invite users to join the Spoofer Users Mailing List for discussion and announcements.