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Session Report

Summary:
Test run at: 2018-10-23 13:35:12 GMT
Client Prefix (v4): 73.150.238.x/24
Client AS (v4): 7922 (COMCAST-7922)
IPv4 Probes: 124
Client Prefix (v6): 2001:558:14xx::/40
Client AS (v6): 7922 (COMCAST-7922)
IPv6 Probes: 82
Outbound spoofing summary (from the client to our server)
Source address type IPv4IPv6
Private - RFC1918 or ULA blockedunknown
Routable blockedunknown
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.
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 (73.150.238.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
73.150.238.x/24/317922natblock
73.150.238.x/24/307922natblock
73.150.238.x/24/297922natblock
73.150.238.x/24/287922natblock
73.150.238.x/24/277922natblock
73.150.238.x/24/267922natblock
73.150.238.x/24/257922natblock
73.150.238.x/24/247922natblock
73.150.239.x/24/237922natblock
73.150.236.x/24/227922natblock
73.150.234.x/24/217922natblock
73.150.230.x/24/207922natblock
73.150.254.x/24/197922natblock
73.150.206.x/24/187922natblock
73.150.174.x/24/177922natblock
73.150.110.x/24/167922natblock
73.151.238.x/24/157922natblock
73.148.238.x/24/147922natblock
73.146.238.x/24/137922natblock
73.158.238.x/24/127922natblock
73.134.238.x/24/117922natblock
73.182.238.x/24/107922natblock
73.214.238.x/24/97922natblock
73.22.238.x/24/87922natblock

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 Adjacent Netblock Testing:
Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
2001:558:14xx::/40/1207922no
2001:558:14xx::/40/1127922no
2001:558:14xx::/40/1047922no
2001:558:14xx::/40/967922no
2001:558:14xx::/40/887922no
2001:558:14xx::/40/807922no
2001:558:14xx::/40/727922no
2001:558:14xx::/40/647922no
2001:558:14xx::/40/567922no
2001:558:14xx::/40/487922no
2001:558:14xx::/40/407922no
2001:558:94xx::/40/327922no
2001:5d8:14xx::/40/243742no
2001:8558:14xx::/40/161221no

Meaning of status in Received column:

noPackets spoofed from adjacent netblock were not received, probably due to blocking
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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