Session Report

Summary:

Test run at: 2025-11-24 01:10:41 GMT
Client Prefix (v4): 58.206.205.x/24
Client AS (v4): 4538 (ERX-CERNET-BKB)
IPv4 Probes: 162
Client Prefix (v6): 2001:da8:2xx::/40
Client AS (v6): 23910 (CNGI-CERNET2-AS-AP)
IPv6 Probes: 180

Outbound spoofing summary (from the client to our server)
Source address type	IPv4		IPv6
Private - RFC1918 or ULA	blocked		✔	received
Routable	received		received
Largest spoofable neighbor prefix length	/8		/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.

IPv4 Adjacent Netblock Testing:

Your host (58.206.205.x/24) can spoof 16777215 neighboring addresses (within your /8 prefix)

Spoofed source address (anon)	Prefix Length	ASN of spoofed source address	Received
58.206.205.x/24	/31	4538	yes
58.206.205.x/24	/30	4538	yes
58.206.205.x/24	/29	4538	yes
58.206.205.x/24	/28	4538	yes
58.206.205.x/24	/27	4538	yes
58.206.205.x/24	/26	4538	yes
58.206.205.x/24	/25	4538	yes
58.206.205.x/24	/24	4538	yes
58.206.204.x/24	/23	4538	yes
58.206.207.x/24	/22	4538	yes
58.206.201.x/24	/21	4538	yes
58.206.197.x/24	/20	4538	yes
58.206.221.x/24	/19	4538	yes
58.206.237.x/24	/18	4538	yes
58.206.141.x/24	/17	4538	no
58.206.77.x/24	/16	4538	yes
58.207.205.x/24	/15	4538	yes
58.204.205.x/24	/14	4538	no
58.202.205.x/24	/13	4538	yes
58.198.205.x/24	/12	4538	no
58.222.205.x/24	/11	4134	no
58.238.205.x/24	/10	9318	no
58.142.205.x/24	/9	10036	yes
58.78.205.x/24	/8	3786	yes

Meaning of status in Received column:

no	Packets spoofed from adjacent netblock were not received, probably due to blocking
yes	Packets spoofed from adjacent netblock were received
yes	Packets spoofed from adjacent netblock were received (but that netblock is within the source AS)

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 probes:

Spoofed source address	Destination	Received
2001:48d0:101:501::159	2001:19f0:1000:363e:5400:4ff:fea6:6a66	no
2001:4978:1fb:6400::d2	2001:19f0:1000:363e:5400:4ff:fea6:6a66	no
2001:49aa:111:aa00::11	2001:19f0:1000:363e:5400:4ff:fea6:6a66	no
fd11:1111:1111::1111	2001:19f0:1000:363e:5400:4ff:fea6:6a66	no
2001:48d0:101:501::159	2001:19f0:5401:182d:5400:4ff:fea6:69f9	yes
2001:4978:1fb:6400::d2	2001:19f0:5401:182d:5400:4ff:fea6:69f9	no
2001:49aa:111:aa00::11	2001:19f0:5401:182d:5400:4ff:fea6:69f9	no
fd11:1111:1111::1111	2001:19f0:5401:182d:5400:4ff:fea6:69f9	no
2001:48d0:101:501::159	2001:19f0:5c00:1e23:5400:4ff:fea6:6b47	yes
2001:4978:1fb:6400::d2	2001:19f0:5c00:1e23:5400:4ff:fea6:6b47	no
2001:49aa:111:aa00::11	2001:19f0:5c00:1e23:5400:4ff:fea6:6b47	no
fd11:1111:1111::1111	2001:19f0:5c00:1e23:5400:4ff:fea6:6b47	no
2001:48d0:101:501::159	2001:19f0:6001:5827:5400:4ff:fea6:6ab2	yes
2001:4978:1fb:6400::d2	2001:19f0:6001:5827:5400:4ff:fea6:6ab2	no
2001:49aa:111:aa00::11	2001:19f0:6001:5827:5400:4ff:fea6:6ab2	no
fd11:1111:1111::1111	2001:19f0:6001:5827:5400:4ff:fea6:6ab2	no
2001:48d0:101:501::159	2001:19f0:6402:893:5400:4ff:fea6:6a5c	no
2001:4978:1fb:6400::d2	2001:19f0:6402:893:5400:4ff:fea6:6a5c	no
2001:49aa:111:aa00::11	2001:19f0:6402:893:5400:4ff:fea6:6a5c	no
fd11:1111:1111::1111	2001:19f0:6402:893:5400:4ff:fea6:6a5c	no
2001:48d0:101:501::159	2001:19f0:6801:6b9:5400:4ff:fea6:6a34	no
2001:4978:1fb:6400::d2	2001:19f0:6801:6b9:5400:4ff:fea6:6a34	no
2001:49aa:111:aa00::11	2001:19f0:6801:6b9:5400:4ff:fea6:6a34	no
fd11:1111:1111::1111	2001:19f0:6801:6b9:5400:4ff:fea6:6a34	no
2001:48d0:101:501::159	2001:19f0:6c00:1da9:5400:4ff:fea6:6a74	yes
2001:4978:1fb:6400::d2	2001:19f0:6c00:1da9:5400:4ff:fea6:6a74	no
2001:49aa:111:aa00::11	2001:19f0:6c00:1da9:5400:4ff:fea6:6a74	no
fd11:1111:1111::1111	2001:19f0:6c00:1da9:5400:4ff:fea6:6a74	no
2001:48d0:101:501::159	2001:19f0:7402:9aa:5400:4ff:fea6:6ac6	yes
2001:4978:1fb:6400::d2	2001:19f0:7402:9aa:5400:4ff:fea6:6ac6	no
2001:49aa:111:aa00::11	2001:19f0:7402:9aa:5400:4ff:fea6:6ac6	no
fd11:1111:1111::1111	2001:19f0:7402:9aa:5400:4ff:fea6:6ac6	no
2001:48d0:101:501::159	2001:19f0:9003:8b9:5400:4ff:fea6:6b22	yes
2001:4978:1fb:6400::d2	2001:19f0:9003:8b9:5400:4ff:fea6:6b22	no
2001:49aa:111:aa00::11	2001:19f0:9003:8b9:5400:4ff:fea6:6b22	no
fd11:1111:1111::1111	2001:19f0:9003:8b9:5400:4ff:fea6:6b22	no
2001:48d0:101:501::159	2001:19f0:ac00:3671:5400:4ff:fea6:6b71	no
2001:4978:1fb:6400::d2	2001:19f0:ac00:3671:5400:4ff:fea6:6b71	no
2001:49aa:111:aa00::11	2001:19f0:ac00:3671:5400:4ff:fea6:6b71	no
fd11:1111:1111::1111	2001:19f0:ac00:3671:5400:4ff:fea6:6b71	no
2001:48d0:101:501::159	2001:19f0:b002:1ef:5400:4ff:fea6:6be9	yes
2001:4978:1fb:6400::d2	2001:19f0:b002:1ef:5400:4ff:fea6:6be9	no
2001:49aa:111:aa00::11	2001:19f0:b002:1ef:5400:4ff:fea6:6be9	no
fd11:1111:1111::1111	2001:19f0:b002:1ef:5400:4ff:fea6:6be9	no
2001:48d0:101:501::159	2001:19f0:b400:16a4:5400:4ff:fea6:6b0d	no
2001:4978:1fb:6400::d2	2001:19f0:b400:16a4:5400:4ff:fea6:6b0d	no
2001:49aa:111:aa00::11	2001:19f0:b400:16a4:5400:4ff:fea6:6b0d	no
fd11:1111:1111::1111	2001:19f0:b400:16a4:5400:4ff:fea6:6b0d	no
2001:48d0:101:501::159	2001:19f0:b800:1b21:5400:4ff:fea5:cd5a	yes
2001:4978:1fb:6400::d2	2001:19f0:b800:1b21:5400:4ff:fea5:cd5a	no
2001:49aa:111:aa00::11	2001:19f0:b800:1b21:5400:4ff:fea5:cd5a	no
fd11:1111:1111::1111	2001:19f0:b800:1b21:5400:4ff:fea5:cd5a	no
2001:48d0:101:501::159	2001:19f0:c000:d254:5400:4ff:fea5:cd47	no
2001:4978:1fb:6400::d2	2001:19f0:c000:d254:5400:4ff:fea5:cd47	no
2001:49aa:111:aa00::11	2001:19f0:c000:d254:5400:4ff:fea5:cd47	no
fd11:1111:1111::1111	2001:19f0:c000:d254:5400:4ff:fea5:cd47	no
2001:48d0:101:501::159	2001:19f0:c800:2f95:5400:4ff:fea6:6b55	yes
2001:4978:1fb:6400::d2	2001:19f0:c800:2f95:5400:4ff:fea6:6b55	no
2001:49aa:111:aa00::11	2001:19f0:c800:2f95:5400:4ff:fea6:6b55	no
fd11:1111:1111::1111	2001:19f0:c800:2f95:5400:4ff:fea6:6b55	no
2001:48d0:101:501::159	2001:40b0:7500:280::5458:517a	no
2001:4978:1fb:6400::d2	2001:40b0:7500:280::5458:517a	yes
2001:49aa:111:aa00::11	2001:40b0:7500:280::5458:517a	yes
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	no
2001:49aa:111:aa00::11	2001:48d0:101:501::242	no
fd11:1111:1111::1111	2001:48d0:101:501::242	no
2001:48d0:101:501::159	2001:48d0:101:501::247	yes
2001:4978:1fb:6400::d2	2001:48d0:101:501::247	no
2001:49aa:111:aa00::11	2001:48d0:101:501::247	no
fd11:1111:1111::1111	2001:48d0:101:501::247	no
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	no
2001:49aa:111:aa00::11	2001:770:1c:7:225:90ff:fe0c:acb4	no
fd11:1111:1111::1111	2001:770:1c:7:225:90ff:fe0c:acb4	no
2001:48d0:101:501::159	2001:d18:1:45:da3a:ddff:fe30:e1c8	no
2001:4978:1fb:6400::d2	2001:d18:1:45:da3a:ddff:fe30:e1c8	yes
2001:49aa:111:aa00::11	2001:d18:1:45:da3a:ddff:fe30:e1c8	yes
fd11:1111:1111::1111	2001:d18:1:45:da3a:ddff:fe30:e1c8	yes
2001:48d0:101:501::159	2401:c080:1000:4fdc:5400:4ff:fea6:6b3a	yes
2001:4978:1fb:6400::d2	2401:c080:1000:4fdc:5400:4ff:fea6:6b3a	no
2001:49aa:111:aa00::11	2401:c080:1000:4fdc:5400:4ff:fea6:6b3a	no
fd11:1111:1111::1111	2401:c080:1000:4fdc:5400:4ff:fea6:6b3a	no
2001:48d0:101:501::159	2401:c080:1400:763f:5400:4ff:fea6:6b65	no
2001:4978:1fb:6400::d2	2401:c080:1400:763f:5400:4ff:fea6:6b65	no
2001:49aa:111:aa00::11	2401:c080:1400:763f:5400:4ff:fea6:6b65	no
fd11:1111:1111::1111	2401:c080:1400:763f:5400:4ff:fea6:6b65	no
2001:48d0:101:501::159	2401:c080:1800:4f38:5400:4ff:fea6:6ba4	yes
2001:4978:1fb:6400::d2	2401:c080:1800:4f38:5400:4ff:fea6:6ba4	no
2001:49aa:111:aa00::11	2401:c080:1800:4f38:5400:4ff:fea6:6ba4	no
fd11:1111:1111::1111	2401:c080:1800:4f38:5400:4ff:fea6:6ba4	no
2001:48d0:101:501::159	2401:c080:1c00:2303:5400:4ff:fea6:6a7e	no
2001:4978:1fb:6400::d2	2401:c080:1c00:2303:5400:4ff:fea6:6a7e	no
2001:49aa:111:aa00::11	2401:c080:1c00:2303:5400:4ff:fea6:6a7e	no
fd11:1111:1111::1111	2401:c080:1c00:2303:5400:4ff:fea6:6a7e	no
2001:48d0:101:501::159	2401:c080:2000:1929:5400:4ff:fea6:6b07	yes
2001:4978:1fb:6400::d2	2401:c080:2000:1929:5400:4ff:fea6:6b07	no
2001:49aa:111:aa00::11	2401:c080:2000:1929:5400:4ff:fea6:6b07	no
fd11:1111:1111::1111	2401:c080:2000:1929:5400:4ff:fea6:6b07	no
2001:48d0:101:501::159	2401:c080:2400:167d:5400:4ff:fea6:6a20	no
2001:4978:1fb:6400::d2	2401:c080:2400:167d:5400:4ff:fea6:6a20	no
2001:49aa:111:aa00::11	2401:c080:2400:167d:5400:4ff:fea6:6a20	no
fd11:1111:1111::1111	2401:c080:2400:167d:5400:4ff:fea6:6a20	no
2001:48d0:101:501::159	2401:c080:3000:27ce:5400:4ff:fea6:6a0b	yes
2001:4978:1fb:6400::d2	2401:c080:3000:27ce:5400:4ff:fea6:6a0b	no
2001:49aa:111:aa00::11	2401:c080:3000:27ce:5400:4ff:fea6:6a0b	no
fd11:1111:1111::1111	2401:c080:3000:27ce:5400:4ff:fea6:6a0b	no
2001:48d0:101:501::159	2401:c080:3400:2851:5400:4ff:fea6:6a4d	yes
2001:4978:1fb:6400::d2	2401:c080:3400:2851:5400:4ff:fea6:6a4d	no
2001:49aa:111:aa00::11	2401:c080:3400:2851:5400:4ff:fea6:6a4d	no
fd11:1111:1111::1111	2401:c080:3400:2851:5400:4ff:fea6:6a4d	no
2001:48d0:101:501::159	2401:c080:3800:3731:5400:4ff:fea6:6a90	no
2001:4978:1fb:6400::d2	2401:c080:3800:3731:5400:4ff:fea6:6a90	no
2001:49aa:111:aa00::11	2401:c080:3800:3731:5400:4ff:fea6:6a90	no
fd11:1111:1111::1111	2401:c080:3800:3731:5400:4ff:fea6:6a90	no
2001:48d0:101:501::159	2607:8400:2880:4::80df:9d0d	yes
2001:4978:1fb:6400::d2	2607:8400:2880:4::80df:9d0d	no
2001:49aa:111:aa00::11	2607:8400:2880:4::80df:9d0d	no
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	no
2001:49aa:111:aa00::11	2607:f278:2:13:da3a:ddff:fe30:ce14	no
fd11:1111:1111::1111	2607:f278:2:13:da3a:ddff:fe30:ce14	no
2001:48d0:101:501::159	2a05:f480:1400:28fc:5400:4ff:fea6:69e9	no
2001:4978:1fb:6400::d2	2a05:f480:1400:28fc:5400:4ff:fea6:69e9	no
2001:49aa:111:aa00::11	2a05:f480:1400:28fc:5400:4ff:fea6:69e9	no
fd11:1111:1111::1111	2a05:f480:1400:28fc:5400:4ff:fea6:69e9	no
2001:48d0:101:501::159	2a05:f480:2000:1f7b:5400:4ff:fea6:6b85	yes
2001:4978:1fb:6400::d2	2a05:f480:2000:1f7b:5400:4ff:fea6:6b85	no
2001:49aa:111:aa00::11	2a05:f480:2000:1f7b:5400:4ff:fea6:6b85	no
fd11:1111:1111::1111	2a05:f480:2000:1f7b:5400:4ff:fea6:6b85	no
2001:48d0:101:501::159	2a05:f480:2400:1f3f:5400:4ff:fea6:6bdb	yes
2001:4978:1fb:6400::d2	2a05:f480:2400:1f3f:5400:4ff:fea6:6bdb	no
2001:49aa:111:aa00::11	2a05:f480:2400:1f3f:5400:4ff:fea6:6bdb	no
fd11:1111:1111::1111	2a05:f480:2400:1f3f:5400:4ff:fea6:6bdb	no
2001:48d0:101:501::159	2a05:f480:2800:16b7:5400:4ff:fea6:6adf	yes
2001:4978:1fb:6400::d2	2a05:f480:2800:16b7:5400:4ff:fea6:6adf	no
2001:49aa:111:aa00::11	2a05:f480:2800:16b7:5400:4ff:fea6:6adf	no
fd11:1111:1111::1111	2a05:f480:2800:16b7:5400:4ff:fea6:6adf	no
2001:48d0:101:501::159	2a05:f480:2c00:15ba:5400:4ff:fea6:6bcc	yes
2001:4978:1fb:6400::d2	2a05:f480:2c00:15ba:5400:4ff:fea6:6bcc	no
2001:49aa:111:aa00::11	2a05:f480:2c00:15ba:5400:4ff:fea6:6bcc	no
fd11:1111:1111::1111	2a05:f480:2c00:15ba:5400:4ff:fea6:6bcc	no
2001:48d0:101:501::159	2a05:f480:3000:22ab:5400:4ff:fea6:6aa6	yes
2001:4978:1fb:6400::d2	2a05:f480:3000:22ab:5400:4ff:fea6:6aa6	no
2001:49aa:111:aa00::11	2a05:f480:3000:22ab:5400:4ff:fea6:6aa6	no
fd11:1111:1111::1111	2a05:f480:3000:22ab:5400:4ff:fea6:6aa6	no
2001:48d0:101:501::159	2a05:f480:3400:294b:5400:4ff:fea6:6af1	yes
2001:4978:1fb:6400::d2	2a05:f480:3400:294b:5400:4ff:fea6:6af1	no
2001:49aa:111:aa00::11	2a05:f480:3400:294b:5400:4ff:fea6:6af1	no
fd11:1111:1111::1111	2a05:f480:3400:294b:5400:4ff:fea6:6af1	no

IPv6 Adjacent Netblock Testing:

Spoofed source address (anon)	Prefix Length	ASN of spoofed source address	Received
2001:da8:2xx::/40	/120	23910	yes
2001:da8:2xx::/40	/112	23910	yes
2001:da8:2xx::/40	/104	23910	yes
2001:da8:2xx::/40	/96	23910	yes
2001:da8:2xx::/40	/88	23910	yes
2001:da8:2xx::/40	/80	23910	yes
2001:da8:2xx::/40	/72	23910	yes
2001:da8:2xx::/40	/64	23910	yes
2001:da8:2xx::/40	/56	23910	yes
2001:da8:2xx::/40	/48	23910	yes
2001:da8:2xx::/40	/40	4538	no
2001:da8:82xx::/40	/32	23910	no
2001:d28:2xx::/40	/24	9621	yes
2001:8da8:2xx::/40	/16	1221	yes

Meaning of status in Received column:

no	Packets spoofed from adjacent netblock were not received, probably due to blocking
yes	Packets spoofed from adjacent netblock were received
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.

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.