AS212138: the AS_TSB network
Monitore os PCs da sua empresa em tempo real, com dados objetivos.
Testar grátis 14 dias →AS212138 is an internet Autonomous System operated by AS_TSB (Czechia). Here is what that means and why this number may show up when you investigate a connection on your network.
What is AS212138?
An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS212138 was assigned to AS_TSB by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.
Reach on the internet
AS212138 currently announces 2 IPv4 block(s), totaling about 1 thousand addresses (1,024 in all), registered in Czechia. Services from AS_TSB are reached through these addresses.
What it means to see AS212138 on your network
When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS212138. That means the other end sits on the AS_TSB network (Czechia). It can be legitimate — a cloud service, an ISP, a CDN — or an unexpected connection worth checking.
How to see every connection and network your devices reach
Tracing one connection's ASN at a time is tedious. Sentinela, by PC Monitor, maps the devices on your network, shows what is exposed to the internet and helps flag suspicious connections and devices — running on your Windows. Meet Sentinela.
Prefere falar com a gente antes de instalar?
Deixe seus dados e um especialista mostra, no seu contexto, como o PC Monitor ajuda a resolver isso na sua empresa. Sem compromisso.
Perguntas frequentes
Who owns AS212138?
AS212138 is assigned to AS_TSB, registered in Czechia.
What is an ASN (Autonomous System)?
It is a unique number identifying a network with its own routing policy on the internet. RIRs (regional registries) assign these numbers to carriers, ISPs and companies.
How many IP addresses does AS212138 control?
AS212138 currently announces about 1 thousand routed IPv4 addresses.