Logo

Session Report

Summary:
Test run at: 2023-10-27 12:01:47 GMT
Client Prefix (v4): 58.251.166.x/24
Client AS (v4): 17623 (CNCGROUP-SZ)
IPv4 Probes: 69
Client Prefix (v6): 2001:da8:2dxx::/40
Client AS (v6): 4538 (ERX-CERNET-BKB)
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 /25/48
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 (58.251.166.x/24) can spoof 127 neighboring addresses (within your /25 prefix)


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
58.251.166.x/24/3117623yes
58.251.166.x/24/3017623yes
58.251.166.x/24/2917623yes
58.251.166.x/24/2817623yes
58.251.166.x/24/2717623yes
58.251.166.x/24/2617623yes
58.251.166.x/24/2517623yes
58.251.166.x/24/2417623natblock
58.251.167.x/24/2317623natblock
58.251.164.x/24/2217623natblock
58.251.162.x/24/2117623natblock
58.251.174.x/24/2017623natblock
58.251.182.x/24/1917623natblock
58.251.134.x/24/1817623natblock
58.251.230.x/24/1717623natblock
58.251.38.x/24/1617623natblock
58.250.166.x/24/1517623natblock
58.249.166.x/24/1417816natblock
58.255.166.x/24/1317816natblock
58.243.166.x/24/12140726natblock
58.235.166.x/24/119318natblock
58.219.166.x/24/104134natblock
58.187.166.x/24/918403natblock
58.123.166.x/24/89318natblock

Meaning of status in Received column:

yesPackets spoofed from adjacent netblock were received (but that netblock is within the source AS)
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 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 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::1592001:770:1c:7:225:90ff:fe0c:acb4no
2001:4978:1fb:6400::d22001:770:1c:7:225:90ff:fe0c:acb4no
2001:49aa:111:aa00::112001:770:1c:7:225:90ff:fe0c:acb4no
fd11:1111:1111::11112001:770:1c:7:225:90ff:fe0c:acb4no
IPv6 Adjacent Netblock Testing:
Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
2001:da8:2dxx::/40/1204538yes
2001:da8:2dxx::/40/1124538yes
2001:da8:2dxx::/40/1044538yes
2001:da8:2dxx::/40/964538yes
2001:da8:2dxx::/40/884538yes
2001:da8:2dxx::/40/804538no
2001:da8:2dxx::/40/724538yes
2001:da8:2dxx::/40/644538yes
2001:da8:2dxx::/40/564538yes
2001:da8:2dxx::/40/484538yes
2001:da8:2dxx::/40/4023910no
2001:da8:adxx::/40/3223910no
2001:d28:2dxx::/40/249621no
2001:8da8:2dxx::/40/161221no

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.
Last Modified