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 (199.21.149.x/24) can spoof 0 neighboring addresses
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
199.21.149.x/24
/31
22923
natblock
199.21.149.x/24
/30
22923
natblock
199.21.149.x/24
/29
22923
natblock
199.21.149.x/24
/28
22923
natblock
199.21.149.x/24
/27
22923
natblock
199.21.149.x/24
/26
22923
natblock
199.21.149.x/24
/25
22923
natblock
199.21.149.x/24
/24
22923
natblock
199.21.148.x/24
/23
22923
natblock
199.21.151.x/24
/22
22923
natblock
199.21.145.x/24
/21
16412
natblock
199.21.157.x/24
/20
20419
natblock
199.21.133.x/24
/19
21651
natblock
199.21.181.x/24
/18
5769
natblock
199.21.213.x/24
/17
14653
natblock
199.21.21.x/24
/16
UNROUTED
natblock
199.20.149.x/24
/15
18756
natblock
199.23.149.x/24
/14
UNROUTED
natblock
199.17.149.x/24
/13
675
natblock
199.29.149.x/24
/12
174
natblock
199.5.149.x/24
/11
2828
natblock
199.53.149.x/24
/10
UNROUTED
natblock
199.85.149.x/24
/9
UNROUTED
natblock
199.149.149.x/24
/8
4152
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.
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
IPv6 Adjacent Netblock Testing:
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
2604:6880:c7xx::/40
/120
22923
natblock
2604:6880:c7xx::/40
/112
22923
natblock
2604:6880:c7xx::/40
/104
22923
natblock
2604:6880:c7xx::/40
/96
22923
natblock
2604:6880:c7xx::/40
/88
22923
natblock
2604:6880:c7xx::/40
/80
22923
natblock
2604:6880:c7xx::/40
/72
22923
natblock
2604:6880:c7xx::/40
/64
22923
natblock
2604:6880:c7xx::/40
/56
22923
natblock
2604:6880:c7xx::/40
/48
22923
natblock
2604:6880:c7xx::/40
/40
22923
natblock
2604:6880:47xx::/40
/32
22923
natblock
2604:6800:c7xx::/40
/24
36436
natblock
2604:e880:c7xx::/40
/16
40156
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.
Summary:
The results from all tests are aggregated to produce a summary
"State of IP Spoofing" report.
