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.
Warnings:
⚠️ Your host is behind a Network Address Translation (NAT) router or firewall which rewrites the source addresses of the test traffic. To test your provider's network further, you must remove the NAT/firewall/router and connect directly.
⚠️ Your host was unable to source even non-spoofed IPv6 UDP traffic to our servers. A firewall, router or other middlebox is preventing our testing. To test your provider's network further, you must remove the firewall or router and connect directly.
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 (172.56.64.x/24) can spoof 0 neighboring addresses
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
172.56.64.x/24
/31
21928
sendto
172.56.64.x/24
/30
21928
sendto
172.56.64.x/24
/29
21928
sendto
172.56.64.x/24
/28
21928
sendto
172.56.64.x/24
/27
21928
sendto
172.56.64.x/24
/26
21928
sendto
172.56.64.x/24
/25
21928
sendto
172.56.64.x/24
/24
21928
rewritten
172.56.65.x/24
/23
21928
sendto
172.56.66.x/24
/22
21928
sendto
172.56.68.x/24
/21
21928
sendto
172.56.72.x/24
/20
21928
sendto
172.56.80.x/24
/19
21928
sendto
172.56.96.x/24
/18
21928
sendto
172.56.0.x/24
/17
21928
sendto
172.56.192.x/24
/16
21928
sendto
172.57.64.x/24
/15
21928
sendto
172.58.64.x/24
/14
21928
sendto
172.60.64.x/24
/13
21928
sendto
172.48.64.x/24
/12
21928
sendto
172.40.64.x/24
/11
21928
sendto
172.24.64.x/24
/10
UNROUTED
sendto
172.120.64.x/24
/9
18779
sendto
172.184.64.x/24
/8
8075
sendto
Meaning of status in Received column:
rewritten
The source address of the probe packets we received differs from the spoofed address. It appears that an intermediate device is rewriting your packet headers.
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.
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 Adjacent Netblock Testing:
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
2607:fb90:3fxx::/40
/120
21928
no
2607:fb90:3fxx::/40
/112
21928
no
2607:fb90:3fxx::/40
/104
21928
no
2607:fb90:3fxx::/40
/96
21928
no
2607:fb90:3fxx::/40
/88
21928
no
2607:fb90:3fxx::/40
/80
21928
no
2607:fb90:3fxx::/40
/72
21928
no
2607:fb90:3fxx::/40
/64
21928
no
2607:fb90:3fxx::/40
/56
21928
no
2607:fb90:3fxx::/40
/48
21928
no
2607:fb90:3fxx::/40
/40
21928
no
2607:fb90:bfxx::/40
/32
21928
no
2607:fb10:3fxx::/40
/24
2906
no
2607:7b90:3fxx::/40
/16
UNROUTED
no
Meaning of status in Received column:
no
Packets spoofed from adjacent netblock were not received, probably due to blocking
Summary:
The results from all tests are aggregated to produce a summary
"State of IP Spoofing" report.
