> For the complete documentation index, see [llms.txt](https://docs.defguard.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.defguard.net/for-developers/rest-api/core/static-ip/check-whether-a-single-static-ip-assignment-would-be-valid.md).

# Check whether a single static IP assignment would be valid

```json
{"openapi":"3.1.0","info":{"title":"defguard Core API","version":"2.0.3"},"tags":[{"name":"static IP","description":"Static IP addresses assigned to user devices."}],"security":[{"cookie":[]},{"api_token":[]}],"components":{"securitySchemes":{"cookie":{"type":"apiKey","in":"cookie","name":"defguard_session"},"api_token":{"type":"http","scheme":"bearer"}},"schemas":{"ValidateIpAssignmentRequest":{"type":"object","required":["device_id","ip","location"],"properties":{"device_id":{"type":"integer","format":"int64"},"ip":{"type":"string"},"location":{"$ref":"#/components/schemas/i64"}}},"i64":{"type":"integer","format":"int64"},"ApiErrorResponse":{"type":"object","description":"Body returned with error responses.","required":["msg"],"properties":{"code":{"type":["string","null"],"description":"Machine-readable error code, returned for selected errors."},"msg":{"type":"string","description":"Human-readable error message."}}}}},"paths":{"/api/v1/device/user/{username}/ip/validate":{"post":{"tags":["static IP"],"summary":"Check whether a single static IP assignment would be valid","operationId":"validate_ip_assignment","parameters":[{"name":"username","in":"path","description":"Name of the user.","required":true,"schema":{"type":"string"}}],"requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/ValidateIpAssignmentRequest"}}},"required":true},"responses":{"200":{"description":"Validation result.","content":{"application/json":{"schema":{"type":"object"}}}},"400":{"description":"Invalid IP assignment.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ApiErrorResponse"}}}},"401":{"description":"Session is missing or invalid.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ApiErrorResponse"}}}},"403":{"description":"Requires admin privileges.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ApiErrorResponse"}}}},"500":{"description":"Unable to validate IP assignment.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ApiErrorResponse"}}}}}}}}}
```