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 but spoofed packets are still being received without modification. See here for more information.
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 (187.16.136.x/24) can spoof 16777215 neighboring addresses (within your /8 prefix)
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
187.16.136.x/24
/31
28254
yes
187.16.136.x/24
/30
28254
yes
187.16.136.x/24
/29
28254
natblock
187.16.136.x/24
/28
28254
yes
187.16.136.x/24
/27
28254
yes
187.16.136.x/24
/26
28254
yes
187.16.136.x/24
/25
28254
yes
187.16.136.x/24
/24
28254
yes
187.16.137.x/24
/23
28254
yes
187.16.138.x/24
/22
28254
yes
187.16.140.x/24
/21
28254
yes
187.16.128.x/24
/20
28254
yes
187.16.152.x/24
/19
28255
yes
187.16.168.x/24
/18
28256
yes
187.16.200.x/24
/17
UNROUTED
natblock
187.16.8.x/24
/16
263162
yes
187.17.136.x/24
/15
UNROUTED
natblock
187.18.136.x/24
/14
28270
yes
187.20.136.x/24
/13
28573
yes
187.24.136.x/24
/12
22085
yes
187.0.136.x/24
/11
28238
yes
187.48.136.x/24
/10
17379
yes
187.80.136.x/24
/9
26615
yes
187.144.136.x/24
/8
8151
yes
Meaning of status in Received column:
yes
Packets spoofed from adjacent netblock were received
yes
Packets spoofed from adjacent netblock were received (but that netblock is within the source AS)
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
able to spoof routable, non-adjacent source addresses through the
first 10 IP hop(s).
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 address
Destination
Received
2001:4978:1fb:6400::d2
2001:388:1:5001:21c:c0ff:fea2:4a3a
yes
2001:49aa:111:aa00::11
2001:388:1:5001:21c:c0ff:fea2:4a3a
yes
fd11:1111:1111::1111
2001:388:1:5001:21c:c0ff:fea2:4a3a
yes
2001:4978:1fb:6400::d2
2001:410:102:1::78
yes
2001:49aa:111:aa00::11
2001:410:102:1::78
yes
fd11:1111:1111::1111
2001:410:102:1::78
yes
2001:4978:1fb:6400::d2
2001:410:90ff::5
yes
2001:49aa:111:aa00::11
2001:410:90ff::5
yes
fd11:1111:1111::1111
2001:410:90ff::5
yes
2001:4978:1fb:6400::d2
2001:48d0:101:501::242
yes
2001:49aa:111:aa00::11
2001:48d0:101:501::242
yes
fd11:1111:1111::1111
2001:48d0:101:501::242
yes
2001:4978:1fb:6400::d2
2001:48d0:101:501::247
yes
2001:49aa:111:aa00::11
2001:48d0:101:501::247
yes
fd11:1111:1111::1111
2001:48d0:101:501::247
yes
IPv6 Adjacent Netblock Testing:
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
2804:618:xx::/40
/120
28254
yes
2804:618:xx::/40
/112
28254
yes
2804:618:xx::/40
/104
28254
yes
2804:618:xx::/40
/96
28254
yes
2804:618:xx::/40
/88
28254
yes
2804:618:xx::/40
/80
28254
yes
2804:618:xx::/40
/72
28254
yes
2804:618:xx::/40
/64
28254
yes
2804:618:xx::/40
/56
28254
yes
2804:618:xx::/40
/48
28254
yes
2804:618:xx::/40
/40
28254
yes
2804:618:80xx::/40
/32
28254
yes
2804:698:xx::/40
/24
UNROUTED
yes
2804:8618:xx::/40
/16
UNROUTED
yes
Meaning of status in Received column:
yes
Packets spoofed from adjacent netblock were received (but that netblock is within the source AS)
Summary:
The results from all tests are aggregated to produce a summary
"State of IP Spoofing" report.