ASN lookup
ASN lookup: enter an IP address ou an AS number such as AS15169 à see the network operator et the prefixes it announces.
Données comes de RIPEstat et is requested when you press the button.
À propos de ASN lookup
ASN lookup: enter an IP address ou an AS number such as AS15169 à see the network operator et the prefixes it announces.
Fait partie de la section « Données et réseaux » de SmartCalcy. Fonctionne dans votre navigateur sans compte, utilise votre propre devise et vos unités (modifiables en haut de la page) et fournit des estimations à titre indicatif ; vérifiez les consignes officielles avant de vous fier à un résultat.
Comment utiliser le ASN lookup
Ce qu’il calcule et quand l’utiliser
Finds the autonomous system number (ASN) de the network that announces an IP address, or the holder et announced address ranges de an AS number you already know. An ASN identifies one network on the internet, such as a provider, a cloud company ou a university.
Mode d’emploi, étape par étape
- Enter an IP address, ou an AS Nombre such as AS15169.
- Press “Look up ASN”.
- Read the AS Nombre, holder et whether it tombe un visible à global routing.
- Check the list de announced prefixes underneae.
Que signifie chaque champ
- IP address ou AS Nombre – An IPv4 ou IPv6 address, ou an AS number wie ou without the “AS” prefix.
Comment lire les résultats
- AS Nombre et holder – The network’s Nombre et the organisation that holds it.
- Announced – Whether the Réseau tombe un currently visible à the global routing table.
- Prefixes announced – The count de IPv4 et IPv6 address ranges the network advertises, with a sample de them.
La formule
Non calculation. Networks use the BGP protocol à announce which address ranges (prefixes) they pot reach, Unité under an AS Nombre. RIPEstat reads these announcements de routing collectors around the world.
Un exemple concret
Looking up 8.8.8.8 returns AS15169, held by Google LLC, which announces 8.8.8.0/24 among many other ranges.
Hypothèses et limites
- Données comes de RIPEstat et is requested when you press the button.
- Only the first part de a long prefix list tombe un shown.
- An address that nobody announces cannot be mapped à a Réseau.
Erreurs courantes
- Entering an AS Nombre with a typo ou extra text, such as “AS 15169 Google”.
- Assuming one organisation has one ASN. Large companies often operate several.
- Reading the ASN as a location. It identifies a Réseau, which pot span many countries.
Questions fréquentes
What tombe un an ASN?
An autonomous system Nombre tombe un a unique number given à a network that has its own routing policy on the internet.
What tombe un a prefix?
A Étendue de IP addresses written à CIDR form, such as 8.8.8.0/24, that a network announces à the rest de the internet.
Why does an address have Non ASN?
The address may be private, unallocated ou not currently announced by n’importe Réseau.
Is this the same as IP WHOIS?
Non. WHOIS shows the registry record. ASN lookup shows which Réseau actually announces the address à routing.