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Session Report

Summary:
Test run at: 2023-02-03 22:34:39 GMT
Client Prefix (v4): 191.241.23.x/24
Client AS (v4): 263541
IPv4 Probes: 60
Client Prefix (v6): 2804:1398:2xx::/40
Client AS (v6): 263541
IPv6 Probes: 52
Outbound spoofing summary (from the client to our server)
Source address type IPv4IPv6
Private - RFC1918 or ULA blockedreceived
Routable blockedreceived
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.
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 (191.241.23.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
191.241.23.x/24/31263541natblock
191.241.23.x/24/30263541natblock
191.241.23.x/24/29263541natblock
191.241.23.x/24/28263541natblock
191.241.23.x/24/27263541natblock
191.241.23.x/24/26263541natblock
191.241.23.x/24/25263541natblock
191.241.23.x/24/24263541natblock
191.241.22.x/24/23263541natblock
191.241.21.x/24/22263541natblock
191.241.19.x/24/21268976natblock
191.241.31.x/24/20263664natblock
191.241.7.x/24/19263663natblock
191.241.55.x/24/18263667natblock
191.241.87.x/24/1753076natblock
191.241.151.x/24/16262784natblock
191.240.23.x/24/1528202natblock
191.243.23.x/24/14263276natblock
191.245.23.x/24/1322085natblock
191.249.23.x/24/1218881natblock
191.225.23.x/24/1126615natblock
191.209.23.x/24/1027699natblock
191.177.23.x/24/928573natblock
191.113.23.x/24/87418natblock

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 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::242no
2001:49aa:111:aa00::112001:48d0:101:501::242no
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::247no
2001:49aa:111:aa00::112001:48d0:101:501::247no
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:acb4no
2001:49aa:111:aa00::112001:770:1c:7:225:90ff:fe0c:acb4no
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
2804:1398:2xx::/40/120263541yes
2804:1398:2xx::/40/112263541rewritten
2804:1398:2xx::/40/104263541rewritten
2804:1398:2xx::/40/96263541rewritten
2804:1398:2xx::/40/88263541rewritten
2804:1398:2xx::/40/80263541yes
2804:1398:2xx::/40/72263541yes
2804:1398:2xx::/40/64263541yes
2804:1398:2xx::/40/56263541rewritten
2804:1398:2xx::/40/48263541rewritten
2804:1398:2xx::/40/40263541rewritten
2804:1398:82xx::/40/32263541rewritten
2804:1318:2xx::/40/24UNROUTEDrewritten
2804:9398:2xx::/40/16UNROUTEDrewritten

Meaning of status in Received column:

yesPackets spoofed from adjacent netblock were received (but that netblock is within the source AS)
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.
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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