AS9021 — ISNET

AS9021 announces 31 IPv4 prefixes covering 147,712 addresses and 1 IPv6 prefixes.

About this network

ISNET is İşNet, a Turkish internet and telecom services provider established in 1999 and a subsidiary of İşbank (Türkiye İş Bankası).

What it's used for

Internet access and communications services aimed largely at corporate customers. Sampled reverse DNS is dominated by generic ptr-90-158-NNN-NNN.is.net.tr static-style naming plus VoIP hosts (mgcp-.voiptest.is.net.tr), with no dsl/pppoe/dyn subscriber-pool markers, consistent with business/static assignments rather than a mass consumer eyeball pool.

Notable

A sizeable provider footprint across 90.158.0.0/90.159.0.0, 213.143.x, 212.98.x and other blocks. Live routing status was unavailable in the pack, but the prefix inventory and first-party is.net.tr rDNS confirm a genuine, self-operated Turkish ISP.

Interesting

Being owned by İşbank, İşNet grew out of a bank's IT/telecom arm into a commercial ISP and data-centre operator, which is why its addressing reads more corporate than residential.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 90.158.0.0/17
• 90.158.128.0/18
• 90.158.192.0/19
• 90.158.224.0/20
• 90.158.240.0/21
• 90.158.248.0/23
• 90.158.251.0/24
• 90.158.252.0/22
• 90.159.0.0/17
• 90.159.128.0/18
• 90.159.192.0/20
• 90.159.240.0/20
• 185.66.124.0/23
• 185.237.68.0/22
• 212.98.0.0/19
• 213.143.225.0/24
• 213.143.226.0/23
• 213.143.228.0/22
• 213.143.232.0/21
• 213.143.240.0/21
• 213.143.248.0/23
• 213.143.250.0/24
• 213.143.252.0/22
• 213.161.128.0/23
• 213.161.130.0/24
• 213.161.132.0/22
• 213.161.136.0/21
• 213.161.144.0/23
• 213.161.146.0/24
• 213.161.148.0/22
• 213.161.152.0/21
• 2a00:1f90::/32

Upstream networks

• AS9121 Turk Telekomunikasyon Anonim Sirketi
• AS32787 Akamai Technologies, Inc.
• AS34984 Superonline Iletisim Hizmetleri A.S.

Downstream networks

• AS7155 ViaSat,Inc.
• AS51321 PUSULA YATIRIM MENKUL DEGERLER A.S.
• AS34996 Anadolu Anonim Turk Sigorta Sirketi
• AS51739 Is Yatirim Menkul Degerler A.S.
• AS60056 YATIRIM FINANSMAN MENKUL DEGERLER ANONIM SIRKETI
• AS49027 Turkiye Sinai Kalkinma Bankasi Anonim Sirketi
• AS28781 PAYTEN TEKNOLOJI ANONIM SIRKETI

Adjacent networks

• AS9121 Turk Telekomunikasyon Anonim Sirketi
• AS32787 Akamai Technologies, Inc.
• AS7155 ViaSat,Inc.
• AS34984 Superonline Iletisim Hizmetleri A.S.
• AS51321 PUSULA YATIRIM MENKUL DEGERLER A.S.
• AS34996 Anadolu Anonim Turk Sigorta Sirketi
• AS49027 Turkiye Sinai Kalkinma Bankasi Anonim Sirketi
• AS51739 Is Yatirim Menkul Degerler A.S.
• AS60056 YATIRIM FINANSMAN MENKUL DEGERLER ANONIM SIRKETI
• AS28781 PAYTEN TEKNOLOJI ANONIM SIRKETI