AS45588 — BTCL-ISP-AS - Bangladesh Telecommunications Company Limited (BTCL), Nationwide PSTN Operator and Data and Internet Service Provider.

AS45588 announces 31 IPv4 prefixes covering 42,752 addresses and 4 IPv6 prefixes.

About this network

BTCL-ISP-AS is operated by Bangladesh Telecommunications Company Limited (BTCL).

What it's used for

• The address space carries fixed-line and broadband subscriber traffic, evidenced by netnames BTTB-BD and BTCL-Infobahan-Project and reverse DNS records pointing to ip.atbtcl.net.bd.
• With 42,752 IPv4 addresses announced across 62 prefixes and 18 observed neighbours, the high address-to-neighbour ratio indicates an access network serving end-users rather than a transit provider.
• As the largest government-owned telecommunications company in Bangladesh, this AS carries traffic for fixed-line telephone, DSL, and cable internet subscribers across the country.

Notable

• Registrants consistently identify as Bangladesh Telegraph & Telephone Board (BTTB), the predecessor name to BTCL, confirming the AS belongs to the same government entity.
• BTCL was founded as the Bangladesh Telegraph & Telephone Board and was later renamed to Bangladesh Telecommunications Company Limited, with 100% government ownership.
• The inventory includes both legacy 114.130.0.0/16 space and newer 180.211.0.0/16 allocations, with IPv6 prefixes in the 2407:5000::/32 range.

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

Announced prefixes

• 114.130.128.0/19
• 114.130.160.0/23
• 114.130.162.0/24
• 114.130.164.0/23
• 114.130.166.0/24
• 114.130.168.0/23
• 114.130.171.0/24
• 114.130.172.0/22
• 114.130.176.0/23
• 114.130.180.0/22
• 114.130.184.0/21
• 180.211.128.0/18
• 180.211.192.0/21
• 180.211.205.0/24
• 180.211.207.0/24
• 180.211.210.0/23
• 180.211.214.0/23
• 180.211.219.0/24
• 180.211.227.0/24
• 180.211.228.0/24
• 180.211.232.0/23
• 180.211.237.0/24
• 180.211.238.0/23
• 180.211.243.0/24
• 180.211.247.0/24
• 180.211.248.0/21
• 203.112.200.0/22
• 203.112.206.0/24
• 203.112.209.0/24
• 203.112.210.0/23
• 203.112.212.0/22
• 2407:5000:1::/48
• 2407:5000:2::/47
• 2407:5000:800::/40
• 2407:5000:7000::/39

Upstream networks

• AS17494 Telecom Operator & Internet Service Provider as well

Downstream networks

• AS141438 Bangladesh SEZ Ltd.
• AS137706 National University
• AS150304 Bangladesh Television
• AS149445 Patriot Technologies
• AS137568 SKY SYSTEMS LTD
• AS153550 Spider Networks
• AS150442 Bangladesh Fire Service and Civil Defense
• AS134585 DDN Communication
• AS133766 SPEED ONE
• AS63932 Bangladesh Computer Council
• AS149425 Nazrul Network Service@Saidpur
• AS154009 Directorate of Primary Education (DPE)
• AS139773 Bangladesh Bureau of Educational Information and Statistics
• AS134068 Rajshahi Krishi Unnayan Bank
• AS150352 Sky Business Center

Adjacent networks

• AS17494 Telecom Operator & Internet Service Provider as well
• AS141438 Bangladesh SEZ Ltd.
• AS137706 National University
• AS150304 Bangladesh Television
• AS149445 Patriot Technologies
• AS137568 SKY SYSTEMS LTD
• AS134585 DDN Communication
• AS133766 SPEED ONE
• AS150442 Bangladesh Fire Service and Civil Defense
• AS153550 Spider Networks
• AS63932 Bangladesh Computer Council
• AS149425 Nazrul Network Service@Saidpur
• AS154009 Directorate of Primary Education (DPE)
• AS139773 Bangladesh Bureau of Educational Information and Statistics
• AS134068 Rajshahi Krishi Unnayan Bank
• AS150352 Sky Business Center

Routing security

• RPKI: 119 valid, 0 invalid and 0 not-found announcements; 10 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 1,119 route objects.
• Listed in as-sets: AS-10102, AS-56264-TOMATOWEB, AS-HURRICANEV6, AS-KDDCUSTOMER2, AS-SET-BSCCL, AS137385:AS-ASIAN-NETWORK, AS149765:AS-CORONETIIG-BD, AS150748:AS-GMAX, AS17494:AS-CUSTOMERS, AS204464:AS-BLACKLIST, AS3491:AS-CUSTOMERS-AP, AS3491:AS-CUSTOMERS-TEST.