Session Report
Summary:
Test run at: 2025-03-21 09:21:58 GMT
Client Prefix (v4): 58.206.207.x/24
Client AS (v4): 4538 (ERX-CERNET-BKB)
IPv4 Probes: 162
| Outbound spoofing summary (from the client to our server) |
|---|
| Source address type |
IPv4 |
|---|
| Private -
RFC1918 |
blocked |
| Routable |
received |
| Largest spoofable neighbor prefix length |
/8 |
| 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 (58.206.207.x/24) can spoof 16777215 neighboring addresses (within your /8 prefix)
| Spoofed source address (anon) | Prefix
Length | ASN of spoofed
source address | Received |
|---|
| 58.206.207.x/24 | /31 | 4538 | yes |
| 58.206.207.x/24 | /30 | 4538 | yes |
| 58.206.207.x/24 | /29 | 4538 | yes |
| 58.206.207.x/24 | /28 | 4538 | yes |
| 58.206.207.x/24 | /27 | 4538 | yes |
| 58.206.207.x/24 | /26 | 4538 | yes |
| 58.206.207.x/24 | /25 | 4538 | yes |
| 58.206.207.x/24 | /24 | 4538 | yes |
| 58.206.206.x/24 | /23 | 4538 | yes |
| 58.206.205.x/24 | /22 | 4538 | yes |
| 58.206.203.x/24 | /21 | 4538 | yes |
| 58.206.199.x/24 | /20 | 4538 | yes |
| 58.206.223.x/24 | /19 | 4538 | yes |
| 58.206.239.x/24 | /18 | 4538 | yes |
| 58.206.143.x/24 | /17 | 4538 | no |
| 58.206.79.x/24 | /16 | 4538 | yes |
| 58.207.207.x/24 | /15 | 4538 | yes |
| 58.204.207.x/24 | /14 | 4538 | no |
| 58.202.207.x/24 | /13 | 4538 | yes |
| 58.198.207.x/24 | /12 | 4538 | no |
| 58.222.207.x/24 | /11 | 4134 | no |
| 58.238.207.x/24 | /10 | 9318 | no |
| 58.142.207.x/24 | /9 | 10036 | yes |
| 58.78.207.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).
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.
