$ query “AS18403” --type=asn → 1 result(s)
AS18403 · FPT-VN
FPT Telecom Company
AS18403 is owned by FPT Telecom Company and is a major transit provider, established in Vietnam. The system announces an impressive 1.4 million IPv4 addresses, including a /13, and supports IPv6. Its primary geographic footprint is in Vietnam, with additional presence in the United States and Australia, and a smaller footprint in another country. This AS's prefix announcements have been recently modified.
- Top 5% — Top 5% of all autonomous systems by reach and degree
- #4 in Vietnam — Top 10 by reach within country
Basic Information
- Country
- 🇻🇳 Vietnam
- Category
- Internet Service Provider
- Network Role
- Major Transit
- Data Origin
- Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
- Last Changed
- May 26, 2026
- Last Seen
- June 22, 2026 (active)
Prefix Summary
- IPv4 Prefixes (raw / aggregated)
- 4 639 / 26
- IPv6 Prefixes (raw / aggregated)
- 3 394 / 1
- IPv4 Addresses
- 1 422 336
- Largest IPv4 Prefix
- /13 (524 288 addresses)
- Largest IPv6 Prefix
- /30
- Geolocated Countries
- 🇻🇳 Vietnam (2 835 456 IPs), 🇺🇸 United States (3 584 IPs), 🇦🇺 Australia (512 IPs) and 1 more
- Prefix Changed
- June 23, 2026
Reputation
- Reputation
- Good — 157 flagged IPs out of 1 422 336 total (0.01%)
- Open Proxies
- 5 known open proxies in this network
Connectivity Summary
- Upstream Providers
- 13 upstreams providing transit
- Peers
- 265 networks exchanging traffic without transit
- Downstream Customers
- 246 downstreams buying transit
- Unclassified
- 17 unclassified BGP neighbors
- Degree
- 541 unique BGP neighbors
- Reach
- 10 113 networks in customer cone
Upstream Providers (13)
- AS3356 — LEVEL3 (Tier-1 transit)
- AS1299 — TWELVE99 (Tier-1 transit)
- AS13335 — CLOUDFLARENET-AS
- AS2914 — NTT-DATA-2914 (Tier-1 transit)
- AS58453 — CMI-INT-HK
- AS23764 — CTGNET
- AS3491 — PCCWG-AS (Tier-1 transit)
- AS6453 — AS6453 (Tier-1 transit)
- AS4637 — ASN-TELSTRA-GLOBAL
- AS5511 — OPENTRANSIT (Tier-1 transit)
- and 3 more
Prefix Lists
IPv4 Prefixes (4 639 total)
- 42.112.0.0/13 (524 288 addresses (/13 prefix))
- 118.68.0.0/14 (262 144 addresses (/14 prefix))
- 1.52.0.0/14 (262 144 addresses (/14 prefix))
- 58.186.0.0/15 (131 072 addresses (/15 prefix))
- 113.22.0.0/16 (65 536 addresses (/16 prefix))
- 183.80.0.0/16 (65 536 addresses (/16 prefix))
- 210.245.0.0/17 (32 768 addresses (/17 prefix))
- 183.81.0.0/17 (32 768 addresses (/17 prefix))
- 113.23.0.0/17 (32 768 addresses (/17 prefix))
- 203.191.8.0/21 (2 048 addresses (/21 prefix))
- 23.208.160.0/22 (1 024 addresses (/22 prefix))
- 144.48.20.0/22 (1 024 addresses (/22 prefix))
- 23.193.188.0/22 (1 024 addresses (/22 prefix))
- 23.196.68.0/22 (1 024 addresses (/22 prefix))
- 103.39.92.0/22 (1 024 addresses (/22 prefix))
- 103.156.32.0/22 (1 024 addresses (/22 prefix))
- 103.35.64.0/22 (1 024 addresses (/22 prefix))
- 43.239.148.0/22 (1 024 addresses (/22 prefix))
- 103.156.30.0/23 (512 addresses (/23 prefix))
- 103.156.12.0/23 (512 addresses (/23 prefix))
- 103.156.10.0/23 (512 addresses (/23 prefix))
- 23.173.8.0/23 (512 addresses (/23 prefix))
- 23.202.89.0/24 (256 addresses (/24 prefix))
- 151.242.217.0/24 (256 addresses (/24 prefix))
- 23.32.74.0/24 (256 addresses (/24 prefix))
- 218.100.60.0/24 (256 addresses (/24 prefix))
IPv6 Prefixes (3 394 total)
- 2405:4800::/30