Pattern of tests from this IP block indicates a switch from allowing spoofing to blocking it.
rewritten
Spoofed packet was received, but the source address was changed en route.
blocked
Spoofed packet was not received, but unspoofed packet was.
unknown
Neither 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 (63.251.20.x/24) can spoof 0 neighboring addresses
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
63.251.20.x/24
/31
13789
sendto
63.251.20.x/24
/30
13789
sendto
63.251.20.x/24
/29
13789
sendto
63.251.20.x/24
/28
13789
sendto
63.251.20.x/24
/27
13789
sendto
63.251.20.x/24
/26
13789
sendto
63.251.20.x/24
/25
13789
sendto
63.251.20.x/24
/24
13789
sendto
63.251.21.x/24
/23
23480
sendto
63.251.22.x/24
/22
393736
sendto
63.251.16.x/24
/21
13789
sendto
63.251.28.x/24
/20
26558
sendto
63.251.4.x/24
/19
14744
sendto
63.251.52.x/24
/18
14743
sendto
63.251.84.x/24
/17
10913
sendto
63.251.148.x/24
/16
12180
sendto
63.250.20.x/24
/15
27229
sendto
63.249.20.x/24
/14
22030
sendto
63.255.20.x/24
/13
7029
sendto
63.243.20.x/24
/12
7029
sendto
63.235.20.x/24
/11
20940
sendto
63.219.20.x/24
/10
3491
sendto
63.187.20.x/24
/9
1239
sendto
63.123.20.x/24
/8
701
sendto
Meaning of status in Received column:
sendto
The 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.
