AS81 MCNC

NCREN - MCNC · registered in the United States

IPv4 addresses1,957,376196 prefixes · 0.062% of announced IPv4

Rank in United States#58largest network in US by IPv4 space, of 18,338 · 0.14% of US

Rank worldwide#196of 79,396 networks with IPv4

IPv617 x /32 (1,114,613 x /48)66 prefixes

CountryUnited States18,679 ASNs registered there

Open AS81 in ASN lookup Look up an IP in this network (128.109.0.1) All networks in United States

IPv4 prefixes

All 196 prefixes, in address order.

128.109.0.0/16
152.4.0.0/16
152.6.0.0/16
152.8.0.0/14
152.12.0.0/16
152.18.0.0/16
152.20.0.0/15
152.22.2.0/23
152.22.4.0/22
152.22.8.0/21
152.22.16.0/20
152.22.32.0/20
152.22.48.0/21
152.22.56.0/21
152.22.64.0/20
152.22.80.0/21
152.22.88.0/21
152.22.96.0/19
152.22.128.0/18
152.22.192.0/19
152.26.0.0/20
152.26.16.0/24
152.26.17.0/24
152.26.18.0/23
152.26.20.0/22
152.26.24.0/22
152.26.28.0/23
152.26.30.0/24
152.26.32.0/21
152.26.40.0/22
152.26.44.0/24
152.26.45.0/24
152.26.46.0/23
152.26.48.0/22
152.26.52.0/23
152.26.54.0/24
152.26.57.0/24
152.26.58.0/23
152.26.60.0/24
152.26.61.0/24
152.26.62.0/23
152.26.64.0/22
152.26.68.0/23
152.26.70.0/23
152.26.72.0/21
152.26.80.0/21
152.26.92.0/22
152.26.96.0/19
152.26.128.0/17
152.27.0.0/21
152.27.8.0/22
152.27.12.0/24
152.27.13.0/24
152.27.14.0/23
152.27.16.0/20
152.27.32.0/19
152.27.64.0/21
152.27.72.0/23
152.27.75.0/24
152.27.76.0/22
152.27.80.0/20
152.27.96.0/19
152.27.128.0/17
152.28.0.0/23
152.28.2.0/23
152.28.4.0/22
152.28.8.0/21
152.28.16.0/20
152.28.32.0/19
152.28.64.0/18
152.28.128.0/17
152.29.0.0/16
152.30.0.0/21
152.30.8.0/23
152.30.10.0/24
152.30.11.0/24
152.30.12.0/22
152.30.16.0/20
152.30.32.0/19
152.30.64.0/20
152.30.80.0/21
152.30.88.0/22
152.30.92.0/24
152.30.93.0/24
152.30.94.0/23
152.30.96.0/19
152.30.128.0/17
152.32.0.0/18
152.38.0.0/18
152.38.64.0/19
152.38.160.0/19
152.38.192.0/18
152.40.64.0/18
152.40.128.0/17
152.42.64.0/18
152.45.0.0/20
152.45.16.0/22
152.45.20.0/24
152.45.21.0/24
152.45.22.0/23
152.45.24.0/21
152.45.32.0/19
152.45.64.0/18
152.45.128.0/17
152.46.0.0/21
152.46.8.0/23
152.46.10.0/23
152.46.12.0/22
152.46.16.0/20
152.46.32.0/21
152.46.40.0/21
152.46.48.0/20
152.46.64.0/18
152.46.128.0/17
152.47.0.0/16
152.48.0.0/15
152.54.0.0/16
152.60.0.0/22
152.60.4.0/24
152.60.5.0/24
152.60.6.0/23
152.60.8.0/21
152.60.16.0/20
152.60.32.0/19
152.60.64.0/18
152.60.128.0/17
185.83.159.0/24
192.101.21.0/24
192.101.22.0/24
192.101.23.0/24
192.101.24.0/24
192.137.210.0/24
192.154.33.0/24
192.154.43.0/24
192.154.48.0/24
192.154.55.0/24
192.154.58.0/24
192.154.60.0/23
192.154.66.0/24
192.154.76.0/23
192.154.95.0/24
192.189.244.0/24
198.85.0.0/18
198.85.64.0/19
198.85.96.0/20
198.85.112.0/22
198.85.116.0/24
198.85.118.0/23
198.85.120.0/21
198.85.128.0/18
198.85.192.0/20
198.85.208.0/22
198.85.213.0/24
198.85.214.0/23
198.85.216.0/22
198.85.221.0/24
198.85.222.0/24
198.85.224.0/22
198.85.229.0/24
198.85.232.0/21
198.85.240.0/20
198.86.0.0/20
198.86.16.0/21
198.86.24.0/22
198.86.28.0/24
198.86.30.0/23
198.86.32.0/19
198.86.64.0/18
198.86.128.0/18
198.86.192.0/19
198.86.224.0/20
198.86.240.0/21
198.86.248.0/21
204.84.0.0/22
204.84.12.0/22
204.84.16.0/20
204.84.32.0/19
204.84.64.0/23
204.84.67.0/24
204.84.68.0/22
204.84.72.0/21
204.84.80.0/20
204.84.96.0/19
204.84.128.0/18
204.84.192.0/19
204.84.224.0/21
204.84.232.0/22
204.84.236.0/23
204.84.240.0/22
204.84.248.0/22
204.85.0.0/17
204.85.128.0/19
204.85.160.0/20
204.85.192.0/18
206.107.110.0/24
206.211.64.0/19

IPv6 prefixes

All 66 prefixes.

2600:2700::/32
2600:2701::/34
2600:2701:4008::/45
2600:2701:4010::/44
2600:2701:4020::/43
2600:2701:4040::/42
2600:2701:4080::/41
2600:2701:4100::/40
2600:2701:4200::/39
2600:2701:4400::/38
2600:2701:4800::/37
2600:2701:5000::/36
2600:2701:6000::/35
2600:2701:8000::/33
2600:2702::/31
2600:2704::/40
2600:2704:101::/48
2600:2704:102::/47
2600:2704:104::/46
2600:2704:108::/45
2600:2704:110::/44
2600:2704:120::/43
2600:2704:140::/42
2600:2704:180::/41
2600:2704:200::/39
2600:2704:400::/38
2600:2704:800::/37
2600:2704:1000::/36
2600:2704:2000::/35
2600:2704:4000::/34
2600:2704:8000::/33
2600:2705::/32
2600:2706::/31
2600:2708::/29
2602:f64d::/40
2602:f6b8::/40
2610:28::/35
2610:28:2000::/36
2610:28:3000::/41
2610:28:3080::/44
2610:28:3091::/48
2610:28:3092::/47
2610:28:3094::/46
2610:28:3098::/45
2610:28:30a0::/43
2610:28:30c0::/42
2610:28:3100::/40
2610:28:3200::/39
2610:28:3400::/38
2610:28:3800::/37
2610:28:4000::/34
2610:28:8000::/34
2610:28:c000::/35
2610:28:e000::/36
2610:28:f000::/43
2610:28:f021::/48
2610:28:f022::/47
2610:28:f024::/46
2610:28:f028::/45
2610:28:f030::/44
2610:28:f040::/42
2610:28:f080::/41
2610:28:f100::/40
2610:28:f200::/39
2610:28:f400::/38
2610:28:f800::/37

Other ASNs named MCNC

1 other network uses the same organisation name; together with AS81 they announce 1,961,472 IPv4 addresses.

ASNNameIPv4 addresses

AS19718NCNI - MCNC US4,096

Similar-sized networks in United States

ASNNameIPv4 addresses

AS33651#55 CMCS - Comcast Cable Communications, LLC2,267,136

AS16591#56 GOOGLE-FIBER - Google Fiber Inc.2,244,608

AS237#57 MERIT-AS-14 - Merit Network Inc.2,209,148

AS2152#59 CENIC-2152 - CENIC1,916,161

AS5972#60 DNIC-ASBLK-05800-06055 - United States Department of Defense (DoD)1,865,472

AS270#61 AS270 - National Aeronautics and Space Administration1,859,328

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources