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Session Report

Summary:
Test run at: 2021-01-09 21:19:32 GMT
Client Prefix (v4): 172.250.66.x/24
Client AS (v4): 20001 (TWC-20001-PACWEST)
IPv4 Probes: 69
Client Prefix (v6): 2603:8001:95xx::/40
Client AS (v6): 20001 (TWC-20001-PACWEST)
IPv6 Probes: 60
Outbound spoofing summary (from the client to our server)
Source address type IPv4IPv6
Private - RFC1918 or ULA blockedblocked
Routable blockedblocked
Largest spoofable neighbor prefix length none/56
Spoof status key
receivedSpoofed packet was received.Pattern of tests from this IP block indicates a switch from allowing spoofing to blocking it.
rewrittenSpoofed packet was received, but the source address was changed en route.
blockedSpoofed packet was not received, but unspoofed packet was.
unknownNeither 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 (172.250.66.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
172.250.66.x/24/3120001natblock
172.250.66.x/24/3020001natblock
172.250.66.x/24/2920001natblock
172.250.66.x/24/2820001natblock
172.250.66.x/24/2720001natblock
172.250.66.x/24/2620001natblock
172.250.66.x/24/2520001natblock
172.250.66.x/24/2420001natblock
172.250.67.x/24/2320001natblock
172.250.64.x/24/2220001natblock
172.250.70.x/24/2120001natblock
172.250.74.x/24/2020001natblock
172.250.82.x/24/1920001natblock
172.250.98.x/24/1820001natblock
172.250.2.x/24/1720001natblock
172.250.194.x/24/1620001natblock
172.251.66.x/24/1520001natblock
172.248.66.x/24/1420001natblock
172.254.66.x/24/1312271natblock
172.242.66.x/24/127155natblock
172.234.66.x/24/1120940natblock
172.218.66.x/24/10852natblock
172.186.66.x/24/910310natblock
172.122.66.x/24/82497natblock

Meaning of status in Received column:

natblockSpoofed 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 probes:
Spoofed source addressDestinationReceived
2001:48d0:101:501::1592001:48d0:101:501::242no
2001:4978:1fb:6400::d22001:48d0:101:501::242no
2001:49aa:111:aa00::112001:48d0:101:501::242no
fd11:1111:1111::11112001:48d0:101:501::242no
2001:48d0:101:501::1592001:48d0:101:501::247no
2001:4978:1fb:6400::d22001:48d0:101:501::247no
2001:49aa:111:aa00::112001:48d0:101:501::247no
fd11:1111:1111::11112001:48d0:101:501::247no
2001:48d0:101:501::1592001:610:510:115:192:42:115:98no
2001:4978:1fb:6400::d22001:610:510:115:192:42:115:98no
2001:49aa:111:aa00::112001:610:510:115:192:42:115:98no
fd11:1111:1111::11112001:610:510:115:192:42:115:98no
2001:48d0:101:501::1592001:630:212:225:225:90ff:fe0c:45a6no
2001:4978:1fb:6400::d22001:630:212:225:225:90ff:fe0c:45a6no
2001:49aa:111:aa00::112001:630:212:225:225:90ff:fe0c:45a6no
fd11:1111:1111::11112001:630:212:225:225:90ff:fe0c:45a6no
2001:48d0:101:501::1592001:770:18:7:225:90ff:fe0c:acb4no
2001:4978:1fb:6400::d22001:770:18:7:225:90ff:fe0c:acb4no
2001:49aa:111:aa00::112001:770:18:7:225:90ff:fe0c:acb4no
fd11:1111:1111::11112001:770:18:7:225:90ff:fe0c:acb4no
2001:48d0:101:501::1592001:df0:4:800:21c:c0ff:feb2:ad5fno
2001:4978:1fb:6400::d22001:df0:4:800:21c:c0ff:feb2:ad5fno
2001:49aa:111:aa00::112001:df0:4:800:21c:c0ff:feb2:ad5fno
fd11:1111:1111::11112001:df0:4:800:21c:c0ff:feb2:ad5fno
IPv6 Adjacent Netblock Testing:
Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
2603:8001:95xx::/40/12020001yes
2603:8001:95xx::/40/11220001yes
2603:8001:95xx::/40/10420001yes
2603:8001:95xx::/40/9620001yes
2603:8001:95xx::/40/8820001yes
2603:8001:95xx::/40/8020001yes
2603:8001:95xx::/40/7220001yes
2603:8001:95xx::/40/6420001yes
2603:8001:95xx::/40/5620001yes
2603:8001:95xx::/40/4820001no
2603:8001:95xx::/40/4020001no
2603:8001:15xx::/40/3220001no
2603:8081:95xx::/40/2411427no
2603:1:95xx::/40/16UNROUTEDno

Meaning of status in Received column:

noPackets spoofed from adjacent netblock were not received, probably due to blocking
yesPackets 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.
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