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Session Report

Summary:
Test run at: 2021-02-17 07:57:26 GMT
Client Prefix (v4): 219.87.142.x/24
Client AS (v4): 9924 (TFN-TW)
IPv4 Probes: 66
Client Prefix (v6): 2001:b031:1xx::/40
Client AS (v6): 3462 (HINET)
IPv6 Probes: 56
Outbound spoofing summary (from the client to our server)
Source address type IPv4IPv6
Private - RFC1918 or ULA unknownunknown
Routable unknownunknown
Largest spoofable neighbor prefix length nonenone

Meaning of result status in column:

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 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 (219.87.142.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
219.87.142.x/24/319924natblock
219.87.142.x/24/309924natblock
219.87.142.x/24/299924natblock
219.87.142.x/24/289924natblock
219.87.142.x/24/279924natblock
219.87.142.x/24/269924natblock
219.87.142.x/24/259924natblock
219.87.142.x/24/249924natblock
219.87.143.x/24/239924natblock
219.87.140.x/24/229924natblock
219.87.138.x/24/219924natblock
219.87.134.x/24/209924natblock
219.87.158.x/24/199924natblock
219.87.174.x/24/189924natblock
219.87.206.x/24/179924natblock
219.87.14.x/24/169924natblock
219.86.142.x/24/159924natblock
219.85.142.x/24/1418182natblock
219.83.142.x/24/13UNROUTEDnatblock
219.95.142.x/24/124788natblock
219.71.142.x/24/119416natblock
219.119.142.x/24/102497natblock
219.23.142.x/24/917676natblock
219.215.142.x/24/817676natblock

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.
IPv6 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.

  

  
IPv6 Adjacent Netblock Testing:
Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
2001:b031:1xx::/40/1203462natblock
2001:b031:1xx::/40/1123462natblock
2001:b031:1xx::/40/1043462natblock
2001:b031:1xx::/40/963462natblock
2001:b031:1xx::/40/883462natblock
2001:b031:1xx::/40/803462natblock
2001:b031:1xx::/40/723462natblock
2001:b031:1xx::/40/643462natblock
2001:b031:1xx::/40/563462natblock
2001:b031:1xx::/40/483462natblock
2001:b031:1xx::/40/403462natblock
2001:b031:81xx::/40/323462natblock
2001:b0b1:1xx::/40/243462natblock
2001:3031:1xx::/40/16UNROUTEDnatblock

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.
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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