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Session Report

Summary:
Test run at: 2024-05-18 06:58:56 GMT
Client Prefix (v4): 111.172.4.x/24
Client AS (v4): 4134 (CHINANET-BACKBONE)
IPv4 Probes: 69
Client Prefix (v6): 240e:36c:dxx::/40
Client AS (v6): 4134 (CHINANET-BACKBONE)
IPv6 Probes: 64
Outbound spoofing summary (from the client to our server)
Source address type IPv4IPv6
Private - RFC1918 or ULA blockedrewritten
Routable blockedrewritten
Largest spoofable neighbor prefix length nonenone
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 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 (111.172.4.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
111.172.4.x/24/314134natblock
111.172.4.x/24/304134natblock
111.172.4.x/24/294134natblock
111.172.4.x/24/284134natblock
111.172.4.x/24/274134natblock
111.172.4.x/24/264134natblock
111.172.4.x/24/254134natblock
111.172.4.x/24/244134natblock
111.172.5.x/24/234134natblock
111.172.6.x/24/224134natblock
111.172.0.x/24/2158563natblock
111.172.12.x/24/204134natblock
111.172.20.x/24/194134natblock
111.172.36.x/24/184134natblock
111.172.68.x/24/174134natblock
111.172.132.x/24/164134natblock
111.173.4.x/24/154134natblock
111.174.4.x/24/14136194natblock
111.168.4.x/24/132518natblock
111.164.4.x/24/124837natblock
111.188.4.x/24/1117676natblock
111.140.4.x/24/10UNROUTEDnatblock
111.236.4.x/24/92516natblock
111.44.4.x/24/89808natblock

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 probes:
Spoofed source addressDestinationReceived
IPv6 Adjacent Netblock Testing:
Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
240e:36c:dxx::/40/1204134rewritten
240e:36c:dxx::/40/1124134rewritten
240e:36c:dxx::/40/1044134rewritten
240e:36c:dxx::/40/964134rewritten
240e:36c:dxx::/40/884134rewritten
240e:36c:dxx::/40/804134rewritten
240e:36c:dxx::/40/724134rewritten
240e:36c:dxx::/40/644134rewritten
240e:36c:dxx::/40/564134rewritten
240e:36c:dxx::/40/484134rewritten
240e:36c:dxx::/40/404134rewritten
240e:36c:8dxx::/40/324134rewritten
240e:3ec:dxx::/40/244134rewritten
240e:836c:dxx::/40/16UNROUTEDrewritten

Meaning of status in Received column:

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.
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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