IP e rede

ASN Lookup

Informações do sistema autônomo por IP ou domínio.

Fatos principais

ASN lookup by IP or domain: enter an address and see the autonomous system number, the provider or owning organization, the country and the network prefix. Free, no sign-up needed (10 lookups a day, more with an account). Searching by AS number itself is not supported here.

Preço: Grátis
Cadastro: Não é necessário
Processamento: Our server runs the lookup: a domain is resolved to IPv4, the AS number, name, prefix, registry and allocation date come from Team Cymru's IP-to-ASN DNS service, and country and city from the local DB-IP Lite database
Entrada: One IP address or domain per request. An AS number (AS13335) is not accepted — only an IP or a domain; a domain is turned into its first IPv4 address
Limites: 15 requests a minute per IP; daily cap of 10 lookups without an account, 30 with an account, unlimited with Pro
Resultado: AS number and name, provider (ISP) and organization, the IP's country, region and city, and for IPv4 the network prefix, registry (RIR) and allocation date
Última atualização: 2026-10-26

ASN Lookup: sistema autônomo

Look up the autonomous system (AS) of an IP address or domain: ASN, owner organization, network prefix and country. Shows which provider or cloud a server runs on.

Número e nome do ASN

Organização proprietária

Network prefix (IPv4)

Geolocalização

Como usar

Enter an IP address or a domain
The tool finds the autonomous system, provider and network prefix
Review the network data: organization, ASN and country

Casos de uso

Identify the network operator behind suspicious IP traffic.
Analyze competitor infrastructure and CDN ownership.

Limitações

Data depends on public RIR/BGP sources and may lag updates.
Some ranges can be aggregated under large transit operators.

Exemplo de entrada / resultado

Exemplo de entrada

8.8.8.8

Exemplo de resultado

ASN: AS15169, Organization: Google LLC, Registry: ARIN, Prefixes: 235.

FAQ

Type the IP address into the field and press Check: the result card shows the AS number, its name, the organization, the country and, for IPv4, the network prefix. Without a website you can run whois -h whois.cymru.com " -v 8.8.8.8" in a Linux or macOS terminal.

Enter the domain — the tool resolves it to its first IPv4 address and shows that address's ASN. If the site sits behind Cloudflare or another CDN, you see the CDN's network, not the host. It helps to look at the domain's IP addresses first in the domain to IP tool.

An ASN is an autonomous system number: the label for a network run by a single operator such as an ISP, a data centre, a cloud or a large company. Routers use it to decide where traffic goes; for you it shows who owns a block of addresses.

No — this tool's field accepts only an IP address or a domain. To list the prefixes of an AS or find an AS by company name, use the whois command or a service that supports it, such as HackerTarget or DNS Robot.

The address country comes from a geolocation database and describes the IP, while the AS may be registered elsewhere, since a provider's network often spans several regions. For anycast networks such as CDNs the location is almost always approximate, so trust the organization and AS number.

No registration is needed: you get 10 lookups a day without an account, 30 with an account, and no daily cap with Pro. A separate limit of 15 requests a minute per IP applies.

PromoPilot vs. alternativas: comparação

Comparamos apenas o que está confirmado nas páginas de cada serviço. Onde não conseguimos confirmar um dado, a célula mostra "—".

Parâmetro	PromoPilot	HackerTarget	DNS Robot	ShowMyIP
Free use and limits	10 lookups a day without an account, 30 with one, unlimited with Pro	50 free lookups a day (shared across their IP tools)	100% free, no API key	Limit of 10 requests; the window resets after a short time
Works without sign-up	✓	—	✓	—
Data source	Team Cymru + DB-IP Lite	—	RDAP, RIPEstat	—
Preço do plano pago	Pro subscription lifts the cap	Starter $10/mo billed annually ($120)	—	—
Lookup by IP address	✓	✓	✓	✓
Lookup by AS number	✗	✓	✓	—
Domain as input	✓ (IPv4 only)	✗	✗	✓
List of AS prefixes	✗ (one prefix of the IP)	✓	✓ (IPv4 and IPv6)	✓ (CIDR blocks of the AS)
Several addresses at once	✗	✓ (up to 25 on the free tier)	—	—

Role a tabela para os lados

Onde somos mais fracos: We are weaker when you start from an AS number: there is no AS search, no full prefix list, no search by organization name and no bulk mode. For those tasks pick HackerTarget or DNS Robot.

Quando escolher o PromoPilot: IP or domain only (IPv4 for a domain), one address per request; no search by AS number, no prefix list and no bulk mode; 10 lookups a day without an account

Verificado em: 2026-10-16. "—" significa que não foi confirmado na página oficial; condições e preços mudam, então confira os sites dos próprios serviços.