Session Report

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| Data: Stats Summary Recent Tests Remediation Results by AS Results by Country Results by Provider |

Summary:

Test run at: 2025-07-21 15:37:55 GMT
Client Prefix (v4): 38.65.174.x/24
Client AS (v4): 270158
IPv4 Probes: 162
Client Prefix (v6): 2806:319:xx::/40
Client AS (v6): 270158
IPv6 Probes: 180

Outbound spoofing summary (from the client to our server)

Source address type IPv4 IPv6

Private - RFC1918 or ULA ✔ rewritten received

Routable ✔ received received

Largest spoofable neighbor prefix length none /16

Spoof status key
received Spoofed packet was received. ✔ 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.

Outbound spoofing summary (from the client to our server)
Source address type	IPv4	IPv6
Private - RFC1918 or ULA	✔	rewritten	received
Routable	✔	received	received
Largest spoofable neighbor prefix length	none	/16

Spoof status key
received	Spoofed packet was received.	✔	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 (38.65.174.x/24) can spoof 0 neighboring addresses

Spoofed source address (anon) Prefix
Length ASN of spoofed
source address Received

38.65.174.x/24 /31 270158 rewritten

38.65.174.x/24 /30 270158 rewritten

38.65.174.x/24 /29 270158 rewritten

38.65.174.x/24 /28 270158 rewritten

38.65.174.x/24 /27 270158 rewritten

38.65.174.x/24 /26 270158 rewritten

38.65.174.x/24 /25 270158 rewritten

38.65.174.x/24 /24 270158 rewritten

38.65.175.x/24 /23 270158 rewritten

38.65.172.x/24 /22 270172 rewritten

38.65.170.x/24 /21 174 rewritten

38.65.166.x/24 /20 28409 rewritten

38.65.190.x/24 /19 28409 rewritten

38.65.142.x/24 /18 28445 rewritten

38.65.238.x/24 /17 399286 rewritten

38.65.46.x/24 /16 174 rewritten

38.64.174.x/24 /15 174 rewritten

38.67.174.x/24 /14 174 rewritten

38.69.174.x/24 /13 174 rewritten

38.73.174.x/24 /12 174 rewritten

38.81.174.x/24 /11 174 rewritten

38.97.174.x/24 /10 174 rewritten

38.1.174.x/24 /9 174 rewritten

38.193.174.x/24 /8 174 rewritten

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.

Spoofed source address (anon)	Prefix Length	ASN of spoofed source address	Received
38.65.174.x/24	/31	270158	rewritten
38.65.174.x/24	/30	270158	rewritten
38.65.174.x/24	/29	270158	rewritten
38.65.174.x/24	/28	270158	rewritten
38.65.174.x/24	/27	270158	rewritten
38.65.174.x/24	/26	270158	rewritten
38.65.174.x/24	/25	270158	rewritten
38.65.174.x/24	/24	270158	rewritten
38.65.175.x/24	/23	270158	rewritten
38.65.172.x/24	/22	270172	rewritten
38.65.170.x/24	/21	174	rewritten
38.65.166.x/24	/20	28409	rewritten
38.65.190.x/24	/19	28409	rewritten
38.65.142.x/24	/18	28445	rewritten
38.65.238.x/24	/17	399286	rewritten
38.65.46.x/24	/16	174	rewritten
38.64.174.x/24	/15	174	rewritten
38.67.174.x/24	/14	174	rewritten
38.69.174.x/24	/13	174	rewritten
38.73.174.x/24	/12	174	rewritten
38.81.174.x/24	/11	174	rewritten
38.97.174.x/24	/10	174	rewritten
38.1.174.x/24	/9	174	rewritten
38.193.174.x/24	/8	174	rewritten

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
2001:48d0:101:501::159 2001:40b0:7500:280::5458:517a yes
2001:4978:1fb:6400::d2 2001:40b0:7500:280::5458:517a no
2001:49aa:111:aa00::11 2001:40b0:7500:280::5458:517a no
fd11:1111:1111::1111 2001:40b0:7500:280::5458:517a no
2001:48d0:101:501::159 2001:48d0:101:501::242 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
2001:48d0:101:501::159 2001:48d0:101:501::247 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
2001:48d0:101:501::159 2001:770:1c:7:225:90ff:fe0c:acb4 yes
2001:4978:1fb:6400::d2 2001:770:1c:7:225:90ff:fe0c:acb4 yes
2001:49aa:111:aa00::11 2001:770:1c:7:225:90ff:fe0c:acb4 yes
fd11:1111:1111::1111 2001:770:1c:7:225:90ff:fe0c:acb4 yes
2001:48d0:101:501::159 2607:8400:2880:4::80df:9d0d yes
2001:4978:1fb:6400::d2 2607:8400:2880:4::80df:9d0d yes
2001:49aa:111:aa00::11 2607:8400:2880:4::80df:9d0d yes
fd11:1111:1111::1111 2607:8400:2880:4::80df:9d0d no
2001:48d0:101:501::159 2607:f278:2:13:da3a:ddff:fe30:ce14 yes
2001:4978:1fb:6400::d2 2607:f278:2:13:da3a:ddff:fe30:ce14 yes
2001:49aa:111:aa00::11 2607:f278:2:13:da3a:ddff:fe30:ce14 yes
fd11:1111:1111::1111 2607:f278:2:13:da3a:ddff:fe30:ce14 yes

Spoofed source address	Destination	Received
2001:48d0:101:501::159	2001:40b0:7500:280::5458:517a	yes
2001:4978:1fb:6400::d2	2001:40b0:7500:280::5458:517a	no
2001:49aa:111:aa00::11	2001:40b0:7500:280::5458:517a	no
fd11:1111:1111::1111	2001:40b0:7500:280::5458:517a	no
2001:48d0:101:501::159	2001:48d0:101:501::242	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
2001:48d0:101:501::159	2001:48d0:101:501::247	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
2001:48d0:101:501::159	2001:770:1c:7:225:90ff:fe0c:acb4	yes
2001:4978:1fb:6400::d2	2001:770:1c:7:225:90ff:fe0c:acb4	yes
2001:49aa:111:aa00::11	2001:770:1c:7:225:90ff:fe0c:acb4	yes
fd11:1111:1111::1111	2001:770:1c:7:225:90ff:fe0c:acb4	yes
2001:48d0:101:501::159	2607:8400:2880:4::80df:9d0d	yes
2001:4978:1fb:6400::d2	2607:8400:2880:4::80df:9d0d	yes
2001:49aa:111:aa00::11	2607:8400:2880:4::80df:9d0d	yes
fd11:1111:1111::1111	2607:8400:2880:4::80df:9d0d	no
2001:48d0:101:501::159	2607:f278:2:13:da3a:ddff:fe30:ce14	yes
2001:4978:1fb:6400::d2	2607:f278:2:13:da3a:ddff:fe30:ce14	yes
2001:49aa:111:aa00::11	2607:f278:2:13:da3a:ddff:fe30:ce14	yes
fd11:1111:1111::1111	2607:f278:2:13:da3a:ddff:fe30:ce14	yes

IPv6 Adjacent Netblock Testing:

Spoofed source address (anon) Prefix
Length ASN of spoofed
source address Received

2806:319:xx::/40 /120 270158 yes

2806:319:xx::/40 /112 270158 yes

2806:319:xx::/40 /104 270158 yes

2806:319:xx::/40 /96 270158 yes

2806:319:xx::/40 /88 270158 yes

2806:319:xx::/40 /80 270158 yes

2806:319:xx::/40 /72 270158 yes

2806:319:xx::/40 /64 270158 yes

2806:319:xx::/40 /56 270158 yes

2806:319:xx::/40 /48 270158 yes

2806:319:xx::/40 /40 UNROUTED yes

2806:319:80xx::/40 /32 UNROUTED yes

2806:399:xx::/40 /24 UNROUTED yes

2806:8319: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)

Spoofed source address (anon)	Prefix Length	ASN of spoofed source address	Received
2806:319:xx::/40	/120	270158	yes
2806:319:xx::/40	/112	270158	yes
2806:319:xx::/40	/104	270158	yes
2806:319:xx::/40	/96	270158	yes
2806:319:xx::/40	/88	270158	yes
2806:319:xx::/40	/80	270158	yes
2806:319:xx::/40	/72	270158	yes
2806:319:xx::/40	/64	270158	yes
2806:319:xx::/40	/56	270158	yes
2806:319:xx::/40	/48	270158	yes
2806:319:xx::/40	/40	UNROUTED	yes
2806:319:80xx::/40	/32	UNROUTED	yes
2806:399:xx::/40	/24	UNROUTED	yes
2806:8319:xx::/40	/16	UNROUTED	yes

Summary:

The results from all tests are aggregated to produce a summary "State of IP Spoofing" report.

Feedback:

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