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Session Report

Summary:
Test run at: 2024-02-14 08:18:48 GMT
Client Prefix (v4): 71.172.72.x/24
Client AS (v4): 701 (UUNET)
IPv4 Probes: 66
Client Prefix (v6): 2600:4040:a8xx::/40
Client AS (v6): 701 (UUNET)
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 (71.172.72.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
71.172.72.x/24/31701rewritten
71.172.72.x/24/30701rewritten
71.172.72.x/24/29701rewritten
71.172.72.x/24/28701rewritten
71.172.72.x/24/27701rewritten
71.172.72.x/24/26701rewritten
71.172.72.x/24/25701rewritten
71.172.72.x/24/24701rewritten
71.172.73.x/24/23701rewritten
71.172.74.x/24/22701rewritten
71.172.76.x/24/21701rewritten
71.172.64.x/24/20701rewritten
71.172.88.x/24/19701rewritten
71.172.104.x/24/18701rewritten
71.172.8.x/24/17701rewritten
71.172.200.x/24/16701rewritten
71.173.72.x/24/1513977rewritten
71.174.72.x/24/14701rewritten
71.168.72.x/24/1313672rewritten
71.164.72.x/24/12701rewritten
71.188.72.x/24/11701rewritten
71.140.72.x/24/107018rewritten
71.236.72.x/24/97922rewritten
71.44.72.x/24/833363rewritten

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 probes:
Spoofed source addressDestinationReceived
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
2001:48d0:101:501::1592607:8400:2880:4::80df:9d0dno
2001:4978:1fb:6400::d22607:8400:2880:4::80df:9d0dno
2001:49aa:111:aa00::112607:8400:2880:4::80df:9d0dno
fd11:1111:1111::11112607:8400:2880:4::80df:9d0dno
2001:48d0:101:501::1592607:f278:2:13:da3a:ddff:fe30:ce14no
2001:4978:1fb:6400::d22607:f278:2:13:da3a:ddff:fe30:ce14no
2001:49aa:111:aa00::112607:f278:2:13:da3a:ddff:fe30:ce14no
fd11:1111:1111::11112607:f278:2:13:da3a:ddff:fe30:ce14no
IPv6 Adjacent Netblock Testing:
Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
2600:4040:a8xx::/40/120701yes
2600:4040:a8xx::/40/112701yes
2600:4040:a8xx::/40/104701yes
2600:4040:a8xx::/40/96701yes
2600:4040:a8xx::/40/88701yes
2600:4040:a8xx::/40/80701yes
2600:4040:a8xx::/40/72701yes
2600:4040:a8xx::/40/64701yes
2600:4040:a8xx::/40/56701no
2600:4040:a8xx::/40/48701no
2600:4040:a8xx::/40/40701no
2600:4040:28xx::/40/32701no
2600:40c0:a8xx::/40/24701no
2600:c040:a8xx::/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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