Logo

Session Report

Summary:
Test run at: 2021-11-27 23:48:39 GMT
Client Prefix (v4): 75.161.83.x/24
Client AS (v4): 209 (CENTURYLINK-US-LEGACY-QWEST)
IPv4 Probes: 66
Outbound spoofing summary (from the client to our server)
Source address type IPv4
Private - RFC1918 blocked
Routable blocked
Largest spoofable neighbor prefix length none

Meaning of result status in column:

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 (75.161.83.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
75.161.83.x/24/31209natblock
75.161.83.x/24/30209natblock
75.161.83.x/24/29209natblock
75.161.83.x/24/28209natblock
75.161.83.x/24/27209natblock
75.161.83.x/24/26209natblock
75.161.83.x/24/25209natblock
75.161.83.x/24/24209natblock
75.161.82.x/24/23209natblock
75.161.81.x/24/22209natblock
75.161.87.x/24/21209rewritten
75.161.91.x/24/20209rewritten
75.161.67.x/24/19209rewritten
75.161.115.x/24/18209rewritten
75.161.19.x/24/17209rewritten
75.161.211.x/24/16209rewritten
75.160.83.x/24/15209rewritten
75.163.83.x/24/14209rewritten
75.165.83.x/24/13209rewritten
75.169.83.x/24/12209rewritten
75.177.83.x/24/1111426rewritten
75.129.83.x/24/1020115rewritten
75.225.83.x/24/96167rewritten
75.33.83.x/24/87018rewritten

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.
rewrittenThe source address of the probe packets we received differs from the spoofed address. It appears that an intermediate device is rewriting your packet headers.

IPv4 Outbound Filtering Depth:

The tracefilter test found your host unable to spoof routable, non-adjacent source addresses through even the first IP hop.
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