AS23856: the SPTEL-AS-AP SPTEL PTE. LTD. network

AS23856 is an internet Autonomous System operated by SPTEL-AS-AP SPTEL PTE. LTD. (Singapore). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS23856?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS23856 was assigned to SPTEL-AS-AP SPTEL PTE. LTD. by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS23856 currently announces 15 IPv4 block(s), totaling about 66.3 thousand addresses (66,304 in all), registered in Singapore. Services from SPTEL-AS-AP SPTEL PTE. LTD. are reached through these addresses.

What it means to see AS23856 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS23856. That means the other end sits on the SPTEL-AS-AP SPTEL PTE. LTD. network (Singapore). 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.