Session Report

Summary:

Test run at: 2021-10-16 19:15:15 GMT
Client Prefix (v4): 177.67.201.x/24
Client AS (v4): 52664
IPv4 Probes: 66

Outbound spoofing summary (from the client to our server)
Source address type	IPv4
Private - RFC1918	rewritten
Routable	blocked
Largest spoofable neighbor prefix length	/25

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 which rewrites the source addresses of the test traffic. To test your provider's network further, you must remove the NAT/firewall/router and connect directly.

IPv4 AS Route:

This test run probed the following paths in order to infer your ability to send different spoofed source packets. Each node in the graph corresponds to an autonomous system, i.e. different Internet service providers. NOTE: This graph does NOT show if an AS blocks spoofed packets, only the path taken by received spoofed packets. The IP Path Details are available for this run. If non-spoofed packets weren't received at a destination, the traceroute to that destination is not included in this graph and may even cause a totally empty graph.

IPv4 Adjacent Netblock Testing:

Your host (177.67.201.x/24) can spoof 127 neighboring addresses (within your /25 prefix)

Spoofed source address (anon)	Prefix Length	ASN of spoofed source address	Received
177.67.201.x/24	/31	52664	natblock
177.67.201.x/24	/30	52664	natblock
177.67.201.x/24	/29	52664	natblock
177.67.201.x/24	/28	52664	natblock
177.67.201.x/24	/27	52664	yes
177.67.201.x/24	/26	52664	yes
177.67.201.x/24	/25	52664	yes
177.67.201.x/24	/24	52664	natblock
177.67.200.x/24	/23	52664	natblock
177.67.203.x/24	/22	52664	natblock
177.67.205.x/24	/21	52664	natblock
177.67.193.x/24	/20	262526	natblock
177.67.217.x/24	/19	52679	natblock
177.67.233.x/24	/18	52680	natblock
177.67.137.x/24	/17	52663	natblock
177.67.73.x/24	/16	262530	natblock
177.66.201.x/24	/15	53004	natblock
177.65.201.x/24	/14	28573	natblock
177.71.201.x/24	/13	16509	natblock
177.75.201.x/24	/12	271724	natblock
177.83.201.x/24	/11	28573	natblock
177.99.201.x/24	/10	18881	natblock
177.3.201.x/24	/9	8167	natblock
177.195.201.x/24	/8	28573	natblock

Meaning of status in Received column:

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:

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.