Session Report
Test run at: 2020-09-03 03:17:00 GMT
Client Prefix (v4): 173.239.199.x/24
Client AS (v4): 32181 (ASN-GIGENET)
IPv4 Probes: 75
Outbound spoofing summary (from the client to our server) Source address type IPv4 Private - RFC1918 blocked Routable received Largest spoofable neighbor prefix length /12
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 is behind a Network Address Translation (NAT) router or firewall but spoofed packets are still being received without modification. See here for more information.
IPv4 Adjacent Netblock Testing:
Your host (173.239.199.x/24) can spoof 1048575 neighboring addresses (within your /12 prefix)
Spoofed source address (anon) Prefix
LengthASN of spoofed
source addressReceived 173.239.199.x/24 /31 32181 natblock 173.239.199.x/24 /30 32181 natblock 173.239.199.x/24 /29 32181 yes 173.239.199.x/24 /28 32181 yes 173.239.199.x/24 /27 32181 yes 173.239.199.x/24 /26 32181 yes 173.239.199.x/24 /25 32181 yes 173.239.199.x/24 /24 32181 yes 173.239.198.x/24 /23 36351 yes 173.239.197.x/24 /22 UNROUTED natblock 173.239.195.x/24 /21 36351 yes 173.239.207.x/24 /20 36351 yes 173.239.215.x/24 /19 UNROUTED natblock 173.239.231.x/24 /18 12025 yes 173.239.135.x/24 /17 812 yes 173.239.71.x/24 /16 32354 yes 173.238.199.x/24 /15 7992 yes 173.237.199.x/24 /14 UNROUTED natblock 173.235.199.x/24 /13 11272 yes 173.231.199.x/24 /12 22611 yes 173.255.199.x/24 /11 63949 natblock 173.207.199.x/24 /10 UNROUTED natblock 173.175.199.x/24 /9 11427 natblock 173.111.199.x/24 /8 1239 natblock 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 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:
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