ASN lookup
ASN lookup: enter an IP address ou an AS number such as AS15169 a see the network operator e the prefixes it announces.
Dados comes de RIPEstat e is requested when you press the button.
Sobre ASN lookup
ASN lookup: enter an IP address ou an AS number such as AS15169 a see the network operator e the prefixes it announces.
Faz parte da secção «Dados e redes» do SmartCalcy. Funciona no seu navegador sem conta, usa a sua própria moeda e unidades (altere-as no topo da página) e dá estimativas apenas a título informativo, por isso consulte as orientações oficiais antes de confiar num resultado.
Como usar a ASN lookup
O que calcula e quando usar
Finds the autonomous system number (ASN) de the network that announces an IP address, or the holder e 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.
Como usar, passo a passo
- Enter an IP address, ou an AS Número such as AS15169.
- Press “Look up ASN”.
- Read the AS Número, holder e whether it é visible em global routing.
- Check the list de announced prefixes undernea.ª.
O que significa cada campo
- IP address ou AS Número – An IPv4 ou IPv6 address, ou an AS number wi.ª ou without the “AS” prefix.
Como ler os resultados
- AS Número e holder – The network’s Número e the organisation that holds it.
- Announced – Whether the Rede é currently visible em the global routing table.
- Prefixes announced – The count de IPv4 e IPv6 address ranges the network advertises, with a sample de them.
A fórmula
Não calculation. Networks use the BGP protocol a announce which address ranges (prefixes) they lata reach, Cada under an AS Número. RIPEstat reads these announcements de routing collectors around the world.
Um exemplo prático
Looking up 8.8.8.8 returns AS15169, held by Google LLC, which announces 8.8.8.0/24 among many other ranges.
Premissas e limites
- Dados comes de RIPEstat e is requested when you press the button.
- Only the first part de a long prefix list é shown.
- An address that nobody announces cannot be mapped a a Rede.
Erros comuns
- Entering an AS Número 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 Rede, which lata span many countries.
Perguntas frequentes
What é an ASN?
An autonomous system Número é a unique number given a a network that has its own routing policy on the internet.
What é a prefix?
A Amplitude de IP addresses written em CIDR form, such as 8.8.8.0/24, that a network announces a the rest de the internet.
Why does an address have Não ASN?
The address may be private, unallocated ou not currently announced by qualquer Rede.
Is this the same as IP WHOIS?
Não. WHOIS shows the registry record. ASN lookup shows which Rede actually announces the address em routing.