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 (185.169.255.x/24) can spoof 0 neighboring addresses
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
185.169.255.x/24
/31
136787
natblock
185.169.255.x/24
/30
136787
natblock
185.169.255.x/24
/29
136787
natblock
185.169.255.x/24
/28
136787
natblock
185.169.255.x/24
/27
136787
natblock
185.169.255.x/24
/26
136787
natblock
185.169.255.x/24
/25
136787
natblock
185.169.255.x/24
/24
136787
natblock
185.169.254.x/24
/23
32780
natblock
185.169.253.x/24
/22
206264
natblock
185.169.251.x/24
/21
UNROUTED
natblock
185.169.247.x/24
/20
206984
natblock
185.169.239.x/24
/19
56911
natblock
185.169.223.x/24
/18
34458
natblock
185.169.191.x/24
/17
UNROUTED
natblock
185.169.127.x/24
/16
199163
natblock
185.168.255.x/24
/15
18708
natblock
185.171.255.x/24
/14
61161
natblock
185.173.255.x/24
/13
UNROUTED
natblock
185.161.255.x/24
/12
200918
natblock
185.185.255.x/24
/11
43409
natblock
185.137.255.x/24
/10
UNROUTED
natblock
185.233.255.x/24
/9
UNROUTED
natblock
185.41.255.x/24
/8
199321
natblock
Meaning of status in Received column:
natblock
Spoofed 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.
Summary:
The results from all tests are aggregated to produce a summary
"State of IP Spoofing" report.
