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: 2025-04-16 08:08:20 GMT
Client Prefix (v4): 107.77.211.x/24
Client AS (v4): 20057 (ATT-MOBILITY-LLC-AS20057)
Client Prefix (v6): 2600:387:xx::/40
Client AS (v6): 20057 (ATT-MOBILITY-LLC-AS20057)
IPv6 Probes: 56

Outbound spoofing summary (from the client to our server)

Source address type IPv6

Private - ULA blocked

Routable blocked

Largest spoofable neighbor prefix length none

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	IPv6
Private - ULA	blocked
Routable	blocked
Largest spoofable neighbor prefix length	none

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.

IPv6 probes:

Spoofed source address Destination Received

IPv6 Adjacent Netblock Testing:

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

2600:387:xx::/40 /120 20057 natblock

2600:387:xx::/40 /112 20057 natblock

2600:387:xx::/40 /104 20057 natblock

2600:387:xx::/40 /96 20057 natblock

2600:387:xx::/40 /88 20057 natblock

2600:387:xx::/40 /80 20057 natblock

2600:387:xx::/40 /72 20057 natblock

2600:387:xx::/40 /64 20057 natblock

2600:387:xx::/40 /56 20057 natblock

2600:387:xx::/40 /48 20057 natblock

2600:387:xx::/40 /40 7018 natblock

2600:387:80xx::/40 /32 7018 natblock

2600:307:xx::/40 /24 7018 natblock

2600:8387:xx::/40 /16 UNROUTED 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.

Spoofed source address (anon)	Prefix Length	ASN of spoofed source address	Received
2600:387:xx::/40	/120	20057	natblock
2600:387:xx::/40	/112	20057	natblock
2600:387:xx::/40	/104	20057	natblock
2600:387:xx::/40	/96	20057	natblock
2600:387:xx::/40	/88	20057	natblock
2600:387:xx::/40	/80	20057	natblock
2600:387:xx::/40	/72	20057	natblock
2600:387:xx::/40	/64	20057	natblock
2600:387:xx::/40	/56	20057	natblock
2600:387:xx::/40	/48	20057	natblock
2600:387:xx::/40	/40	7018	natblock
2600:387:80xx::/40	/32	7018	natblock
2600:307:xx::/40	/24	7018	natblock
2600:8387:xx::/40	/16	UNROUTED	natblock

Summary:

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

Feedback:

We welcome questions and feedback to the Spoofer Information Mailing List and invite users to join the Spoofer Users Mailing List for discussion and announcements.

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