AS21391: the TDA-AS network
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Testar grátis 14 dias →AS21391 is an internet Autonomous System operated by TDA-AS (Algeria). Here is what that means and why this number may show up when you investigate a connection on your network.
What is AS21391?
An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS21391 was assigned to TDA-AS by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.
Reach on the internet
AS21391 currently announces 1 IPv4 block(s), totaling about 4.1 thousand addresses (4,096 in all), registered in Algeria. Services from TDA-AS are reached through these addresses.
What it means to see AS21391 on your network
When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS21391. That means the other end sits on the TDA-AS network (Algeria). 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.
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Perguntas frequentes
Who owns AS21391?
AS21391 is assigned to TDA-AS, registered in Algeria.
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 AS21391 control?
AS21391 currently announces about 4.1 thousand routed IPv4 addresses.