Test run at: 2019-02-25 17:41:02 GMT
Client Prefix (v4): 5.20.4.x/24
Client AS (v4): 21412 (CGATES-AS)
IPv4 Probes: 116
Outbound spoofing summary (from the client to our server) Source address type IPv4 Private - RFC1918 received Routable received Largest spoofable neighbor prefix length /8
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.
IPv4 Adjacent Netblock Testing:
Your host (5.20.4.x/24) can spoof 16777215 neighboring addresses (within your /8 prefix)
Spoofed source address (anon) Prefix
ASN of spoofed
Received 5.20.4.x/24 /31 21412 natblock 5.20.4.x/24 /30 21412 natblock 5.20.4.x/24 /29 21412 natblock 5.20.4.x/24 /28 21412 natblock 5.20.4.x/24 /27 21412 natblock 5.20.4.x/24 /26 21412 natblock 5.20.4.x/24 /25 21412 natblock 5.20.4.x/24 /24 21412 yes 5.20.5.x/24 /23 21412 natblock 5.20.6.x/24 /22 21412 yes 5.20.0.x/24 /21 21412 natblock 5.20.12.x/24 /20 21412 natblock 5.20.20.x/24 /19 21412 natblock 5.20.36.x/24 /18 21412 natblock 5.20.68.x/24 /17 21412 natblock 5.20.132.x/24 /16 21412 natblock 5.21.4.x/24 /15 50010 natblock 5.22.4.x/24 /14 UNROUTED natblock 5.16.4.x/24 /13 21353 yes 5.28.4.x/24 /12 12303 yes 5.4.4.x/24 /11 6805 natblock 5.52.4.x/24 /10 50810 natblock 5.84.4.x/24 /9 24608 natblock 5.148.4.x/24 /8 25180 yes
Meaning of status in Received column:
yes Packets spoofed from adjacent netblock were received yes Packets spoofed from adjacent netblock were received (but that netblock is within the source AS) 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 able to spoof routable, non-adjacent source addresses through the first 10 IP hop(s).Summary:
The results from all tests are aggregated to produce a summary "State of IP Spoofing" report.Feedback:
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