Session Report
Summary:
Test run at: 2020-08-18 04:10:59 GMT
Client Prefix (v4): 173.249.40.x/24
Client AS (v4): 51167 (CONTABO)
IPv4 Probes: 75
| Outbound spoofing summary (from the client to our server) |
|---|
| Source address type |
IPv4 |
|---|
| Private -
RFC1918 |
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. |
IPv4 Adjacent Netblock Testing:
Your host (173.249.40.x/24) can spoof 0 neighboring addresses
| Spoofed source address (anon) | Prefix
Length | ASN of spoofed
source address | Received |
|---|
| 173.249.40.x/24 | /31 | 51167 | natblock |
| 173.249.40.x/24 | /30 | 51167 | natblock |
| 173.249.40.x/24 | /29 | 51167 | natblock |
| 173.249.40.x/24 | /28 | 51167 | natblock |
| 173.249.40.x/24 | /27 | 51167 | natblock |
| 173.249.40.x/24 | /26 | 51167 | natblock |
| 173.249.40.x/24 | /25 | 51167 | natblock |
| 173.249.40.x/24 | /24 | 51167 | natblock |
| 173.249.41.x/24 | /23 | 51167 | natblock |
| 173.249.42.x/24 | /22 | 51167 | natblock |
| 173.249.44.x/24 | /21 | 51167 | natblock |
| 173.249.32.x/24 | /20 | 51167 | natblock |
| 173.249.56.x/24 | /19 | 51167 | natblock |
| 173.249.8.x/24 | /18 | 51167 | natblock |
| 173.249.104.x/24 | /17 | 22667 | natblock |
| 173.249.168.x/24 | /16 | UNROUTED | natblock |
| 173.248.40.x/24 | /15 | 26472 | natblock |
| 173.251.40.x/24 | /14 | 6128 | natblock |
| 173.253.40.x/24 | /13 | 11878 | natblock |
| 173.241.40.x/24 | /12 | 36068 | natblock |
| 173.233.40.x/24 | /11 | 53347 | natblock |
| 173.217.40.x/24 | /10 | 19108 | natblock |
| 173.185.40.x/24 | /9 | 7029 | natblock |
| 173.121.40.x/24 | /8 | 10507 | 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. |
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:
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and invite users to join the Spoofer
Users Mailing List for discussion and announcements.
