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Session Report

Summary:
Test run at: 2022-03-16 13:42:29 GMT
Client Prefix (v4): 81.142.220.x/24
Client AS (v4): 2856 (BT-UK-AS)
IPv4 Probes: 60
Client Prefix (v6): 2001:67c:10xx::/40
Client AS (v6): 211501 (HIGHTIDEGROUP-AS)
IPv6 Probes: 56
Outbound spoofing summary (from the client to our server)
Source address type IPv4IPv6
Private - RFC1918 or ULA rewrittenreceived
Routable rewrittenreceived
Largest spoofable neighbor prefix length none/16
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 (81.142.220.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
81.142.220.x/24/312856rewritten
81.142.220.x/24/302856rewritten
81.142.220.x/24/292856rewritten
81.142.220.x/24/282856rewritten
81.142.220.x/24/272856rewritten
81.142.220.x/24/262856rewritten
81.142.220.x/24/252856rewritten
81.142.220.x/24/242856rewritten
81.142.221.x/24/232856rewritten
81.142.222.x/24/222856rewritten
81.142.216.x/24/212856rewritten
81.142.212.x/24/202856rewritten
81.142.204.x/24/192856rewritten
81.142.252.x/24/182856rewritten
81.142.156.x/24/172856rewritten
81.142.92.x/24/162856rewritten
81.143.220.x/24/152856rewritten
81.140.220.x/24/142856rewritten
81.138.220.x/24/132856rewritten
81.134.220.x/24/122856rewritten
81.158.220.x/24/112856rewritten
81.174.220.x/24/106871rewritten
81.206.220.x/24/91136rewritten
81.14.220.x/24/813045rewritten

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::242yes
2001:4978:1fb:6400::d22001:48d0:101:501::242yes
2001:49aa:111:aa00::112001:48d0:101:501::242yes
fd11:1111:1111::11112001:48d0:101:501::242yes
2001:48d0:101:501::1592001:48d0:101:501::247yes
2001:4978:1fb:6400::d22001:48d0:101:501::247yes
2001:49aa:111:aa00::112001:48d0:101:501::247yes
fd11:1111:1111::11112001:48d0:101:501::247yes
2001:48d0:101:501::1592001:610:510:115:192:42:115:98yes
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:45a6yes
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:acb4yes
2001:4978:1fb:6400::d22001:770:1c:7:225:90ff:fe0c:acb4yes
2001:49aa:111:aa00::112001:770:1c:7:225:90ff:fe0c:acb4yes
fd11:1111:1111::11112001:770:1c:7:225:90ff:fe0c:acb4yes
IPv6 Adjacent Netblock Testing:
Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
2001:67c:10xx::/40/120211501yes
2001:67c:10xx::/40/112211501yes
2001:67c:10xx::/40/104211501yes
2001:67c:10xx::/40/96211501yes
2001:67c:10xx::/40/88211501yes
2001:67c:10xx::/40/80211501yes
2001:67c:10xx::/40/72211501yes
2001:67c:10xx::/40/64211501yes
2001:67c:10xx::/40/56211501yes
2001:67c:10xx::/40/48211501yes
2001:67c:10xx::/40/4050345yes
2001:67c:90xx::/40/32UNROUTEDyes
2001:6fc:10xx::/40/24UNROUTEDyes
2001:867c:10xx::/40/161221yes

Meaning of status in Received column:

yesPackets spoofed from adjacent netblock were received
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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