Test run at: 2021-11-30 17:57:00 GMT
Client Prefix (v4): 71.85.81.x/24
Client AS (v4): 16787 (CHARTER-16787-DC)
IPv4 Probes: 66
Outbound spoofing summary (from the client to our server) Source address type IPv4 Private - RFC1918 rewritten Routable ✔ blocked Largest spoofable neighbor prefix length /20
Meaning of result status in column:
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 (71.85.81.x/24) can spoof 4095 neighboring addresses (within your /20 prefix)
Spoofed source address (anon) Prefix
ASN of spoofed
Received 71.85.81.x/24 /31 16787 yes 71.85.81.x/24 /30 16787 yes 71.85.81.x/24 /29 16787 yes 71.85.81.x/24 /28 16787 yes 71.85.81.x/24 /27 16787 yes 71.85.81.x/24 /26 16787 yes 71.85.81.x/24 /25 16787 yes 71.85.81.x/24 /24 16787 yes 71.85.80.x/24 /23 16787 yes 71.85.83.x/24 /22 16787 yes 71.85.85.x/24 /21 16787 yes 71.85.89.x/24 /20 16787 yes 71.85.65.x/24 /19 20115 natblock 71.85.113.x/24 /18 20115 natblock 71.85.17.x/24 /17 20115 natblock 71.85.209.x/24 /16 20115 natblock 71.84.81.x/24 /15 20115 natblock 71.87.81.x/24 /14 20115 natblock 71.81.81.x/24 /13 20115 natblock 71.93.81.x/24 /12 20115 natblock 71.69.81.x/24 /11 11426 natblock 71.117.81.x/24 /10 701 natblock 71.21.81.x/24 /9 UNROUTED natblock 71.213.81.x/24 /8 209 natblock
Meaning of status in Received column:
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 1 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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