$ query “AS81” --type=asn → 1 result(s)

AS81 — NCREN

MCNC

AS81 is a mid-size transit provider registered to MCNC, established in the United States in 1986. The network announces an impressive 2.1 million IPv4 addresses, including a /14. Supports IPv6.

  • Top 5% — Top 5% of all autonomous systems by reach and degree
  • Pioneer — Registered before the year 2000

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
August 07, 1986
Last Changed
March 04, 2026
Last Seen
March 05, 2026

Prefix Summary

IPv4 Prefixes (raw / aggregated)
140 / 44
IPv6 Prefixes (raw / aggregated)
3 / 3
IPv4 Addresses
2 093 568
Largest IPv4 Prefix
/14 (262 144 addresses)
Largest IPv6 Prefix
/28
Geolocated Countries
🇺🇸 US (49 IPs), 🇦🇺 AU (6 IPs)
Prefix Changed
March 04, 2026

Reputation

Reputation
Pristine — 0 flagged IPs out of 2 093 568 total (0.00%)
Open Proxies
1 known open proxies in this network

Connectivity Summary

Upstream Providers
7 upstream autonomous systems providing transit
Peers
1 autonomous systems exchanging traffic without transit fees
Downstream Customers
38 downstream autonomous systems buying transit
Degree
47 unique BGP neighbors (providers + customers + peers)
Reach
39 — customer cone size measuring network influence
Degree Rank
#3 104
Reach Rank
#1 655

Upstream Providers (7)

  • AS174 — COGENT-174 (Tier-1 transit)
  • AS3356 — LEVEL3 (Tier-1 transit)
  • AS6461 — ZAYO-6461 (Tier-1 transit)
  • AS7018 — ATT-INTERNET4 (Tier-1 transit)
  • AS11164 — INTERNET2-I2PX (Tier-1 transit)
  • AS11537 — INTERNET2-RESEARCH-EDU
  • AS11426 — TWC-11426-CAROLINAS

Prefix Lists

IPv4 Prefixes (140 total)

  • 152.8.0.0/14 (262 144 addresses)
  • 152.20.0.0/15 (131 072 addresses)
  • 152.26.0.0/15 (131 072 addresses)
  • 152.28.0.0/15 (131 072 addresses)
  • 152.46.0.0/15 (131 072 addresses)
  • 152.48.0.0/15 (131 072 addresses)
  • 204.84.0.0/15 (131 072 addresses)
  • 128.109.0.0/16 (65 536 addresses)
  • 152.4.0.0/16 (65 536 addresses)
  • 152.6.0.0/16 (65 536 addresses)
  • 152.12.0.0/16 (65 536 addresses)
  • 152.18.0.0/16 (65 536 addresses)
  • 152.22.0.0/16 (65 536 addresses)
  • 152.30.0.0/16 (65 536 addresses)
  • 152.35.0.0/16 (65 536 addresses)
  • 152.40.0.0/16 (65 536 addresses)
  • 152.45.0.0/16 (65 536 addresses)
  • 152.54.0.0/16 (65 536 addresses)
  • 152.60.0.0/16 (65 536 addresses)
  • 198.85.0.0/16 (65 536 addresses)
  • 198.86.0.0/16 (65 536 addresses)
  • 152.55.0.0/17 (32 768 addresses)
  • 152.32.0.0/18 (16 384 addresses)
  • 152.38.0.0/18 (16 384 addresses)
  • 152.38.192.0/18 (16 384 addresses)
  • 152.42.64.0/18 (16 384 addresses)
  • 152.38.64.0/19 (8 192 addresses)
  • 152.38.160.0/19 (8 192 addresses)
  • 206.211.64.0/19 (8 192 addresses)
  • 192.101.22.0/23 (512 addresses)
  • 192.154.60.0/23 (512 addresses)
  • 192.154.76.0/23 (512 addresses)
  • 192.101.21.0/24 (256 addresses)
  • 192.101.24.0/24 (256 addresses)
  • 192.137.210.0/24 (256 addresses)
  • 192.154.33.0/24 (256 addresses)
  • 192.154.43.0/24 (256 addresses)
  • 192.154.48.0/24 (256 addresses)
  • 192.154.55.0/24 (256 addresses)
  • 192.154.58.0/24 (256 addresses)
  • 192.154.66.0/24 (256 addresses)
  • 192.154.95.0/24 (256 addresses)
  • 192.189.244.0/24 (256 addresses)
  • 206.107.110.0/24 (256 addresses)

IPv6 Prefixes (3 total)

  • 2600:2700::/28
  • 2610:28::/32
  • 2602:f6b8::/40