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Session Report

Summary:
Test run at: 2021-05-20 20:42:53 GMT
Client Prefix (v4): 138.0.72.x/24
Client AS (v4): 264531
IPv4 Probes: 66
Outbound spoofing summary (from the client to our server)
Source address type IPv4
Private - RFC1918 rewritten
Routable received
Largest spoofable neighbor prefix length /25

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 (138.0.72.x/24) can spoof 127 neighboring addresses (within your /25 prefix)


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
138.0.72.x/24/31264531yes
138.0.72.x/24/30264531yes
138.0.72.x/24/29264531yes
138.0.72.x/24/28264531yes
138.0.72.x/24/27264531yes
138.0.72.x/24/26264531natblock
138.0.72.x/24/25264531yes
138.0.72.x/24/24264531sendto
138.0.73.x/24/23264531sendto
138.0.74.x/24/22264531sendto
138.0.76.x/24/21264540sendto
138.0.64.x/24/20262595sendto
138.0.88.x/24/19264646sendto
138.0.104.x/24/18262216sendto
138.0.8.x/24/1752349sendto
138.0.200.x/24/16263581sendto
138.1.72.x/24/1531898sendto
138.2.72.x/24/14UNROUTEDsendto
138.4.72.x/24/13766sendto
138.8.72.x/24/12UNROUTEDsendto
138.16.72.x/24/1111078sendto
138.32.72.x/24/10UNROUTEDsendto
138.64.72.x/24/94685sendto
138.128.72.x/24/855286sendto

Meaning of status in Received column:

yesPackets spoofed from adjacent netblock were received (but that netblock is within the source AS)
natblockSpoofed probe packets appear to be blocked by your local NAT or firewall rather than being rewritten with a public source address.
sendtoThe spoofer client was unable to send spoofed headers due to an operating system restriction.

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.
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