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 was unable to source even non-spoofed IPv4 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.
⚠️ 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 (163.253.39.x/24) can spoof 0 neighboring addresses
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
163.253.39.x/24
/31
237
no
163.253.39.x/24
/30
237
no
163.253.39.x/24
/29
237
no
163.253.39.x/24
/28
237
no
163.253.39.x/24
/27
237
no
163.253.39.x/24
/26
237
no
163.253.39.x/24
/25
237
no
163.253.39.x/24
/24
237
no
163.253.38.x/24
/23
237
no
163.253.37.x/24
/22
237
no
163.253.35.x/24
/21
UNROUTED
no
163.253.47.x/24
/20
16509
no
163.253.55.x/24
/19
13436
no
163.253.7.x/24
/18
UNROUTED
no
163.253.103.x/24
/17
UNROUTED
no
163.253.167.x/24
/16
UNROUTED
no
163.252.39.x/24
/15
UNROUTED
no
163.255.39.x/24
/14
4766
no
163.249.39.x/24
/13
5133
no
163.245.39.x/24
/12
17
no
163.237.39.x/24
/11
19255
no
163.221.39.x/24
/10
2500
no
163.189.39.x/24
/9
55542
no
163.125.39.x/24
/8
17623
no
Meaning of status in Received column:
no
Packets spoofed from adjacent netblock were not received, probably due to blocking
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
2001:468:26xx::/40
/120
237
no
2001:468:26xx::/40
/112
237
no
2001:468:26xx::/40
/104
237
no
2001:468:26xx::/40
/96
237
no
2001:468:26xx::/40
/88
237
no
2001:468:26xx::/40
/80
237
no
2001:468:26xx::/40
/72
237
no
2001:468:26xx::/40
/64
237
no
2001:468:26xx::/40
/56
237
no
2001:468:26xx::/40
/48
237
no
2001:468:26xx::/40
/40
11537
no
2001:468:a6xx::/40
/32
11537
no
2001:4e8:26xx::/40
/24
6327
no
2001:8468:26xx::/40
/16
1221
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.
