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Session Report

Summary:
Test run at: 2022-06-21 02:27:55 GMT
Client Prefix (v4): 24.20.187.x/24
Client AS (v4): 7922 (COMCAST-7922)
IPv4 Probes: 60
Client Prefix (v6): 2601:1c0:55xx::/40
Client AS (v6): 7922 (COMCAST-7922)
IPv6 Probes: 56
Outbound spoofing summary (from the client to our server)
Source address type IPv4IPv6
Private - RFC1918 or ULA rewrittenblocked
Routable rewrittenblocked
Largest spoofable neighbor prefix length none/64
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 (24.20.187.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
24.20.187.x/24/317922rewritten
24.20.187.x/24/307922rewritten
24.20.187.x/24/297922rewritten
24.20.187.x/24/287922rewritten
24.20.187.x/24/277922rewritten
24.20.187.x/24/267922rewritten
24.20.187.x/24/257922rewritten
24.20.187.x/24/247922rewritten
24.20.186.x/24/237922rewritten
24.20.185.x/24/227922rewritten
24.20.191.x/24/217922rewritten
24.20.179.x/24/207922rewritten
24.20.171.x/24/197922rewritten
24.20.155.x/24/187922rewritten
24.20.251.x/24/177922rewritten
24.20.59.x/24/167922rewritten
24.21.187.x/24/157922rewritten
24.22.187.x/24/147922rewritten
24.16.187.x/24/137922rewritten
24.28.187.x/24/1211427rewritten
24.4.187.x/24/117922rewritten
24.52.187.x/24/10UNROUTEDrewritten
24.84.187.x/24/96327rewritten
24.148.187.x/24/87029rewritten

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.

IPv4 Outbound Filtering Depth:

The tracefilter test found your host able to spoof routable, non-adjacent source addresses through the first 1 IP hop(s).
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
2001:48d0:101:501::1592001:48d0:101:501::242no
2001:4978:1fb:6400::d22001:48d0:101:501::242no
2001:49aa:111:aa00::112001:48d0:101:501::242no
fd11:1111:1111::11112001:48d0:101:501::242no
2001:48d0:101:501::1592001:48d0:101:501::247no
2001:4978:1fb:6400::d22001:48d0:101:501::247no
2001:49aa:111:aa00::112001:48d0:101:501::247no
fd11:1111:1111::11112001:48d0:101:501::247no
2001:48d0:101:501::1592001:610:510:115:192:42:115:98no
2001:4978:1fb:6400::d22001:610:510:115:192:42:115:98no
2001:49aa:111:aa00::112001:610:510:115:192:42:115:98no
fd11:1111:1111::11112001:610:510:115:192:42:115:98no
2001:48d0:101:501::1592001:630:212:225:225:90ff:fe0c:45a6no
2001:4978:1fb:6400::d22001:630:212:225:225:90ff:fe0c:45a6no
2001:49aa:111:aa00::112001:630:212:225:225:90ff:fe0c:45a6no
fd11:1111:1111::11112001:630:212:225:225:90ff:fe0c:45a6no
2001:48d0:101:501::1592001:770:1c:7:225:90ff:fe0c:acb4no
2001:4978:1fb:6400::d22001:770:1c:7:225:90ff:fe0c:acb4no
2001:49aa:111:aa00::112001:770:1c:7:225:90ff:fe0c:acb4no
fd11:1111:1111::11112001:770:1c:7:225:90ff:fe0c:acb4no
IPv6 Adjacent Netblock Testing:
Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
2601:1c0:55xx::/40/1207922yes
2601:1c0:55xx::/40/1127922yes
2601:1c0:55xx::/40/1047922yes
2601:1c0:55xx::/40/967922yes
2601:1c0:55xx::/40/887922yes
2601:1c0:55xx::/40/807922yes
2601:1c0:55xx::/40/727922yes
2601:1c0:55xx::/40/647922yes
2601:1c0:55xx::/40/567922no
2601:1c0:55xx::/40/487922no
2601:1c0:55xx::/40/407922no
2601:1c0:d5xx::/40/327922no
2601:140:55xx::/40/247922no
2601:81c0:55xx::/40/16UNROUTEDno

Meaning of status in Received column:

noPackets spoofed from adjacent netblock were not received, probably due to blocking
yesPackets spoofed from adjacent netblock were received (but that netblock is within the source AS)
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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