TCP SYN Scanner — BGP Route & ASN Lookup
BGP and ASN routing context — bgp-route backend, not live TCP SYN scan
How to Use This Tool
- Enter a public IPv4 address, domain, or ASN identifier.
- bgp-route validates and routes query to BGPView registry lookup.
- Domains resolve to IPv4 A records before ASN mapping.
- ASN input fetches up to twenty ipv4_prefixes with prefixCount.
- IP input returns originating asn, org, country, and prefix hints.
- Review results before authorized port scans on resolved IPv4.
About This Tool
TCP SYN scanning sends SYN packets to probe which ports accept connections — nmap -sS and similar tools measure open, closed, and filtered states from authorized vantage points. VSPIC tcp-syn-scanner is transparent: it calls the bgp-route action with query input — IPv4, resolvable domain, or ASN — returning ASN registry metadata, organization, country, and sample ipv4_prefixes — identical backend to bgp-route-lookup and tcp-port-scanner's routing context path.
There is no live TCP SYN probe, half-open scan, or port state measurement from our infrastructure on this page. For internet-facing TCP port exposure on authorized IPv4, use tcp-port-scanner or shodan-quick-view with shodan action. Scan only IPs you own or are authorized to test.
Common use cases
- •Measure download and upload speed
- •Test open ports on a home router or server
- •Trace routing paths to diagnose latency
Why use VSPIC for ?
- Routing ownership context before TCP port investigation.
- ASN and org identification for scan scope documentation.
- Sample prefixes on ASN queries for provider verification.
- Same bgp-route JSON as bgp-route-lookup.
- Domain and IPv4 flexible input.
- Free instant lookup — no account required.
TCP SYN scanning versus BGP lookup
SYN scanning probes host:port reachability at transport layer. Our page performs bgp-route registry lookup — who originates routes for an IP — not socket-level SYN transmission.
Run tcp-port-scanner on resolved IPv4 after confirming ASN and org ownership.
Relationship to tcp-port-scanner
tcp-port-scanner calls shodan action for indexed TCP ports or basic-scan HEAD probes. tcp-syn-scanner shares bgp-route with bgp-route-lookup — routing context only, not port scan.
What bgp-route returns
IP queries: asn, org, country, prefix hints. ASN queries: registry plus ipv4_prefixes samples and prefixCount.
Authorized scanning ethics
Document rules of engagement before port scans. bgp-route registry queries are passive; tcp-port-scanner contacts target infrastructure.
Relationship to bgp-route-lookup
tcp-syn-scanner and bgp-route-lookup share action bgp-route with identical JSON. SEO pages differ.
API action bgp-route
GET /ip-tools/api/extended?action=bgp-route&query=203.0.113.10. Follow with action shodan on same IP for exposure.
Important notes & limitations
- Does not send TCP SYN packets or measure port states.
- Does not perform half-open or stealth scanning.
- BGP metadata does not prove port availability.
- Unauthorized port scanning may violate provider AUP and laws.
- Use tcp-port-scanner for Shodan-indexed or basic-scan TCP exposure.
Frequently Asked Questions
Yes. VSPIC offers this TCP SYN scanner at no cost with no account required. Results load in real time.
We do not permanently store your queries on our servers. Some tools run entirely in your browser; others fetch public data for the request only.
Yes. Open the page in any modern phone or tablet browser. Results work on Wi‑Fi and mobile data.
No. It runs bgp-route ASN lookup. Use tcp-port-scanner for TCP port exposure on authorized IPv4.
Yes. action bgp-route with query parameter.
Not on this page. tcp-port-scanner offers Shodan-indexed or eight-port basic-scan.
Yes. We resolve to IPv4 A record then run bgp-route ASN mapping.
Confirm ASN and org ownership so scans target intended provider infrastructure.
bgp-route with the query parameter.
Next step for your check
Continue with tcp port scanner on VSPIC.
Related Tools
Explore more free VSPIC tools for IP, DNS, security, and network diagnostics.
TCP Port Scanner
TCP Port Scanner — free online tool
Use Free →Shodan Quick View
Open ports, services, and basic exposure summary
Use Free →BGP Route Lookup
ASN information, route details, and network owner
Use Free →UDP Connectivity Analyzer
UDP Connectivity Analyzer — free online tool
Use Free →Speed Test
Measure download, upload, ping, and jitter for your connection
Use Free →Ping Test
Measure latency to any hostname or IP address
Use Free →
Trusted by Users Who Value Privacy
Always Free
No premium plan ever
100% Private
Files processed in browser
Instant Results
Convert in seconds
Works Everywhere
Any device, any OS