asn.dev

Address space

AS2501 UTNET The University of Tokyo

IPv4 prefixes 4 201K addresses
IPv6 prefixes 16
Most common size /16 IPv4
Flagged 0

Shape

Prefix sizes

IPv4
/16
/16: 3
3
/20
/20: 1
1

How this network carves its IPv4 space. A wall of /24s usually means many small customer assignments or fine-grained traffic engineering; a few short prefixes means large contiguous allocations announced whole.

Shape

Prefix sizes

IPv6
/33
/33: 1
1
/34
/34: 1
1
/35
/35: 1
1
/36
/36: 1
1
/37
/37: 1
1
/38
/38: 1
1
/39
/39: 1
1
/40
/40: 1
1
/41
/41: 1
1
/42
/42: 1
1
/43
/43: 1
1
/44
/44: 1
1
/45
/45: 1
1
/46
/46: 1
1
/47
/47: 2
2

Geography

Where the space lands

CountryNamePrefixes
JPJapan20

Inventory

All prefixes

20 total
PrefixFamilyAddressesCountryFlags
130.69.0.0/16IPv465,536JP
133.11.0.0/16IPv465,536JP
157.82.0.0/16IPv465,536JP
192.51.208.0/20IPv44,096JP
2404:d540::/47IPv6—JP
2404:d540:2::/47IPv6—JP
2404:d540:4::/46IPv6—JP
2404:d540:8::/45IPv6—JP
2404:d540:10::/44IPv6—JP
2404:d540:20::/43IPv6—JP
2404:d540:40::/42IPv6—JP
2404:d540:80::/41IPv6—JP
2404:d540:100::/40IPv6—JP
2404:d540:200::/39IPv6—JP
2404:d540:400::/38IPv6—JP
2404:d540:800::/37IPv6—JP
2404:d540:1000::/36IPv6—JP
2404:d540:2000::/35IPv6—JP
2404:d540:4000::/34IPv6—JP
2404:d540:8000::/33IPv6—JP