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Session Report

Summary:
Test run at: 2020-10-11 03:56:03 GMT
Client Prefix (v4): 173.213.88.x/24
Client AS (v4): 174 (COGENT-174)
IPv4 Probes: 75
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 (173.213.88.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
173.213.88.x/24/31174natblock
173.213.88.x/24/30174natblock
173.213.88.x/24/29174natblock
173.213.88.x/24/28174natblock
173.213.88.x/24/27174natblock
173.213.88.x/24/26174natblock
173.213.88.x/24/25174natblock
173.213.88.x/24/24174natblock
173.213.89.x/24/2362904natblock
173.213.90.x/24/2262904natblock
173.213.92.x/24/2162904natblock
173.213.80.x/24/2062904natblock
173.213.72.x/24/1962904natblock
173.213.120.x/24/1862904natblock
173.213.24.x/24/1753316natblock
173.213.216.x/24/16UNROUTEDnatblock
173.212.88.x/24/1511260natblock
173.215.88.x/24/145056natblock
173.209.88.x/24/13UNROUTEDnatblock
173.221.88.x/24/127029natblock
173.197.88.x/24/1120001natblock
173.245.88.x/24/1018779natblock
173.149.88.x/24/91239natblock
173.85.88.x/24/87011natblock

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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