$ query “AS19855” --type=asn → 1 result(s)

AS19855 · ASN-MASERGY-US

Masergy US Autonomous System

AS19855 belongs to Masergy US Autonomous System and is a mid-size transit provider, based in the United States since 2001. The system announces a solid 159 488 IPv4 addresses, including a /16, and supports IPv6. Its primary geographic footprint is in the United States, with additional presence in the United Kingdom and Canada, and smaller footprints in 18 additional countries. This AS has recently updated its prefix announcements.

Basic Information

Country
🇺🇸 United States
Category
Hosting
Network Role
Mid-size Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
November 01, 2001
Last Changed
May 10, 2026
Last Seen
June 10, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
98 / 19
IPv6 Prefixes (raw / aggregated)
5 / 5
IPv4 Addresses
159 488
Largest IPv4 Prefix
/16 (65 536 addresses)
Largest IPv6 Prefix
/32
Geolocated Countries
🇺🇸 United States (232 976 IPs), 🇬🇧 United Kingdom (19 200 IPs), 🇨🇦 Canada (592 IPs) and 18 more
Prefix Changed
June 05, 2026

Reputation

Reputation
Pristine — 0 flagged IPs

Connectivity Summary

Upstream Providers
8 upstreams providing transit
Downstream Customers
18 downstreams buying transit
Degree
26 unique BGP neighbors
Reach
19 networks in customer cone

Upstream Providers (8)

  • AS174 — COGENT (Tier-1 transit)
  • AS3356 — LEVEL3 (Tier-1 transit)
  • AS3491 — PCCWG-AS (Tier-1 transit)
  • AS12956 — TELXIUS (Tier-1 transit)
  • AS33491 — COMCAST-33491
  • AS7473 — SINGTEL-AS-AP
  • AS7474 — OPTUSCOM-AS01-AU
  • AS7922 — COMCAST-7922

Prefix Lists

IPv4 Prefixes (98 total)

  • 64.47.0.0/16 (65 536 addresses (/16 prefix))
  • 64.138.0.0/17 (32 768 addresses (/17 prefix))
  • 64.138.128.0/18 (16 384 addresses (/18 prefix))
  • 65.96.0.0/18 (16 384 addresses (/18 prefix))
  • 65.96.128.0/18 (16 384 addresses (/18 prefix))
  • 80.241.64.0/20 (4 096 addresses (/20 prefix))
  • 93.187.16.0/21 (2 048 addresses (/21 prefix))
  • 94.199.128.0/21 (2 048 addresses (/21 prefix))
  • 185.60.28.0/22 (1 024 addresses (/22 prefix))
  • 140.242.146.0/23 (512 addresses (/23 prefix))
  • 74.116.49.0/24 (256 addresses (/24 prefix))
  • 45.45.151.0/24 (256 addresses (/24 prefix))
  • 169.143.243.0/24 (256 addresses (/24 prefix))
  • 192.131.149.0/24 (256 addresses (/24 prefix))
  • 192.197.247.0/24 (256 addresses (/24 prefix))
  • 198.73.224.0/24 (256 addresses (/24 prefix))
  • 204.139.40.0/24 (256 addresses (/24 prefix))
  • 204.139.45.0/24 (256 addresses (/24 prefix))
  • 204.139.49.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (5 total)

  • 2402:2100::/32
  • 2607:fa70::/32
  • 2a03:6580::/32
  • 2400:7160:2000::/44
  • 2400:7160:2020::/44