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Session Report

Summary:
Test run at: 2023-11-01 10:50:53 GMT
Client Prefix (v4): 77.164.231.x/24
Client AS (v4): 1136 (KPN)
IPv4 Probes: 69
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
receivedSpoofed packet was received.Pattern of tests from this IP block indicates a switch from allowing spoofing to blocking it.
rewrittenSpoofed packet was received, but the source address was changed en route.
blockedSpoofed packet was not received, but unspoofed packet was.
unknownNeither spoofed nor unspoofed packet was received.

Warnings:

IPv4 Adjacent Netblock Testing:

Your host (77.164.231.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
77.164.231.x/24/311136natblock
77.164.231.x/24/301136natblock
77.164.231.x/24/291136natblock
77.164.231.x/24/281136natblock
77.164.231.x/24/271136natblock
77.164.231.x/24/261136natblock
77.164.231.x/24/251136natblock
77.164.231.x/24/241136natblock
77.164.230.x/24/231136natblock
77.164.229.x/24/221136natblock
77.164.227.x/24/211136natblock
77.164.239.x/24/201136natblock
77.164.247.x/24/191136natblock
77.164.199.x/24/181136natblock
77.164.167.x/24/171136natblock
77.164.103.x/24/161136natblock
77.165.231.x/24/151136natblock
77.166.231.x/24/141136natblock
77.160.231.x/24/131136natblock
77.172.231.x/24/121136natblock
77.180.231.x/24/116805natblock
77.132.231.x/24/1015557natblock
77.228.231.x/24/912430natblock
77.36.231.x/24/842586natblock

Meaning of status in Received column:

natblockSpoofed 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.
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