ASN lookup
ASN lookup: enter an IP address o an AS number such as AS15169 a see the network operator e the prefixes it announces.
Dati comes dalle RIPEstat e is requested when you press the button.
Informazioni su ASN lookup
ASN lookup: enter an IP address o an AS number such as AS15169 a see the network operator e the prefixes it announces.
Fa parte della sezione «Dati e reti» di SmartCalcy. Funziona nel tuo browser senza account, usa la tua valuta e le tue unità (modificabili in cima alla pagina) e fornisce stime solo a scopo informativo, quindi verifica le indicazioni ufficiali prima di fidarti di un risultato.
Come usare il ASN lookup
Cosa calcola e quando usarlo
Finds the autonomous system number (ASN) di the network that announces an IP address, or the holder e announced address ranges di an AS number you already know. An ASN identifies one network on the internet, such as a provider, a cloud company o a university.
Come si usa, passo dopo passo
- Enter an IP address, o an AS Numero such as AS15169.
- Press “Look up ASN”.
- Read the AS Numero, holder e whether it è visible a global routing.
- Check the list di announced prefixes underneaª.
Cosa significa ogni dato
- IP address o AS Numero – An IPv4 o IPv6 address, o an AS number wiª o without the “AS” prefix.
Come leggere i risultati
- AS Numero e holder – The network’s Numero e the organisation that holds it.
- Announced – Whether the Rete è currently visible a the global routing table.
- Prefixes announced – The count di IPv4 e IPv6 address ranges the network advertises, with a sample di them.
La formula
No calculation. Networks use the BGP protocol a announce which address ranges (prefixes) they barattolo reach, Ciascuno under an AS Numero. RIPEstat reads these announcements dalle routing collectors around the world.
Un esempio pratico
Looking up 8.8.8.8 returns AS15169, held by Google LLC, which announces 8.8.8.0/24 among many other ranges.
Ipotesi e limiti
- Dati comes dalle RIPEstat e is requested when you press the button.
- Only the first part di a long prefix list è shown.
- An address that nobody announces cannot be mapped a a Rete.
Errori comuni
- Entering an AS Numero with a typo o 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 Rete, which barattolo span many countries.
Domande frequenti
What è an ASN?
An autonomous system Numero è a unique number given a a network that has its own routing policy on the internet.
What è a prefix?
A Intervallo di IP addresses written a CIDR form, such as 8.8.8.0/24, that a network announces a the rest di the internet.
Why does an address have no ASN?
The address may be private, unallocated o not currently announced by qualsiasi Rete.
Is this the same as IP WHOIS?
No. WHOIS shows the registry record. ASN lookup shows which Rete actually announces the address a routing.