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Session Report

Summary:
Test run at: 2023-11-06 09:05:51 GMT
Client Prefix (v4): 185.177.139.x/24
Client AS (v4): 207176 (OPENFIBER)
IPv4 Probes: 69
Client Prefix (v6): 2a04:8400:c5xx::/40
Client AS (v6): 207176 (OPENFIBER)
IPv6 Probes: 60
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/48
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 (185.177.139.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
185.177.139.x/24/31207176rewritten
185.177.139.x/24/30207176rewritten
185.177.139.x/24/29207176rewritten
185.177.139.x/24/28207176rewritten
185.177.139.x/24/27207176rewritten
185.177.139.x/24/26207176rewritten
185.177.139.x/24/25207176rewritten
185.177.139.x/24/24207176rewritten
185.177.138.x/24/23207176rewritten
185.177.137.x/24/22207176rewritten
185.177.143.x/24/2151492rewritten
185.177.131.x/24/20UNROUTEDrewritten
185.177.155.x/24/19201446rewritten
185.177.171.x/24/183339rewritten
185.177.203.x/24/17206490rewritten
185.177.11.x/24/1644452rewritten
185.176.139.x/24/15206784rewritten
185.179.139.x/24/1441937rewritten
185.181.139.x/24/1343989rewritten
185.185.139.x/24/128920rewritten
185.161.139.x/24/11202204rewritten
185.145.139.x/24/109009rewritten
185.241.139.x/24/956643rewritten
185.49.139.x/24/8202217rewritten

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 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
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
2a04:8400:c5xx::/40/120207176yes
2a04:8400:c5xx::/40/112207176yes
2a04:8400:c5xx::/40/104207176yes
2a04:8400:c5xx::/40/96207176yes
2a04:8400:c5xx::/40/88207176yes
2a04:8400:c5xx::/40/80207176yes
2a04:8400:c5xx::/40/72207176yes
2a04:8400:c5xx::/40/64207176yes
2a04:8400:c5xx::/40/56207176yes
2a04:8400:c5xx::/40/48207176yes
2a04:8400:c5xx::/40/40207176no
2a04:8400:45xx::/40/32207176no
2a04:8480:c5xx::/40/24196714no
2a04:400:c5xx::/40/1634254no

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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