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Session Report

Summary:
Test run at: 2020-08-21 16:09:45 GMT
Client Prefix (v4): 185.142.239.x/24
Client AS (v4): 174 (COGENT-174)
IPv4 Probes: 78
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 (185.142.239.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
185.142.239.x/24/31174natblock
185.142.239.x/24/30174natblock
185.142.239.x/24/29174natblock
185.142.239.x/24/28174natblock
185.142.239.x/24/27174natblock
185.142.239.x/24/26174natblock
185.142.239.x/24/25174natblock
185.142.239.x/24/24174natblock
185.142.238.x/24/23174natblock
185.142.237.x/24/2242237natblock
185.142.235.x/24/21206065natblock
185.142.231.x/24/20203194natblock
185.142.255.x/24/19201873natblock
185.142.207.x/24/18UNROUTEDnatblock
185.142.175.x/24/17203180natblock
185.142.111.x/24/16UNROUTEDnatblock
185.143.239.x/24/15UNROUTEDnatblock
185.140.239.x/24/1448091natblock
185.138.239.x/24/13202126natblock
185.134.239.x/24/1257950natblock
185.158.239.x/24/1151001natblock
185.174.239.x/24/1029256natblock
185.206.239.x/24/9207141natblock
185.14.239.x/24/8UNROUTEDnatblock

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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