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Wyszukiwanie ASN / prefiksów

Mapuj IP do ASN/origin i zobacz ogłaszane prefiksy.

Dane przez DNS Team Cymru; brak zapisu, brak śledzenia.
Wyniki pojawią się tutaj…
Odnajdywanie prefiksów
Lookup IP zwraca prefiks origin, kraj i nazwę ASN (jeśli jest).
Lookup ASN
Zapytaj bezpośrednio numer AS (AS13335), by szybko pobrać nazwę organizacji.
Prywatność i świeżość
Dane pobierane są na żywo przez DNS (Team Cymru); wyniki nie są przechowywane.

O narzędziu

Use ASN lookup to understand which network an IP address belongs to. Instead of focusing on a single IP, ASN/prefix information tells you who announces the range on the internet (ISP, data center, cloud provider, or VPN).

This is useful for security and operations: allowlisting corporate networks, investigating suspicious traffic, or explaining why access differs between regions. ASN data also helps confirm whether traffic comes from a consumer ISP or a hosting provider.

Keep in mind that IP ownership and routing can change. Treat the results as a diagnostic signal and verify with authoritative sources if you’re making critical policy decisions.

FAQ

›What is an ASN?
An Autonomous System Number identifies a network on the internet that announces IP prefixes via BGP.
›What is a prefix?
A prefix is an IP range (CIDR) like 203.0.113.0/24. It represents a block of addresses announced together.
›Is ASN the same as ISP?
Often, but not always. A data center, cloud provider, or VPN can also have an ASN.
›Can I use ASN for allowlisting?
Some systems support ASN-based policies; otherwise, you typically allowlist specific prefixes or IPs.
›Does ASN show the exact location?
No. ASN is about network ownership/routing, not precise geolocation.

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