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Session Report

Summary:
Test run at: 2020-09-02 17:01:54 GMT
Client Prefix (v4): 156.146.60.x/24
Client AS (v4): 60068 (CDN77)
IPv4 Probes: 75
Outbound spoofing summary (from the client to our server)
Source address type IPv4
Private - RFC1918 rewritten
Routable rewritten
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 (156.146.60.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
156.146.60.x/24/3160068natblock
156.146.60.x/24/3060068rewritten
156.146.60.x/24/2960068rewritten
156.146.60.x/24/2860068rewritten
156.146.60.x/24/2760068rewritten
156.146.60.x/24/2660068rewritten
156.146.60.x/24/2560068rewritten
156.146.60.x/24/2460068rewritten
156.146.61.x/24/2360068rewritten
156.146.62.x/24/2260068rewritten
156.146.56.x/24/2160068rewritten
156.146.52.x/24/2060068rewritten
156.146.44.x/24/1960068rewritten
156.146.28.x/24/18398194rewritten
156.146.124.x/24/17395658rewritten
156.146.188.x/24/161448rewritten
156.147.60.x/24/154668rewritten
156.144.60.x/24/143743rewritten
156.150.60.x/24/13UNROUTEDrewritten
156.154.60.x/24/12UNROUTEDrewritten
156.130.60.x/24/11UNROUTEDrewritten
156.178.60.x/24/1036992rewritten
156.210.60.x/24/98452rewritten
156.18.60.x/24/81945rewritten

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.
rewrittenThe source address of the probe packets we received differs from the spoofed address. It appears that an intermediate device is rewriting your packet headers.

IPv4 Outbound Filtering Depth:

The tracefilter test found your host able to spoof routable, non-adjacent source addresses through the first 2 IP hop(s).
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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