The Border Gateway Protocol (BGP) is the protocol backing the core routing decisions on the Internet. It maintains a table of IP networks or 'prefixes' which designate network reachability among autonomous systems (AS). It is described as a path vector protocol. BGP does not use traditional Interior Gateway Protocol (IGP) metrics, but makes routing decisions based on path, network policies and/or rulesets. For this reason, it is more appropriately termed a reachability protocol rather than routing protocol.

Sunday, March 13, 2011

[bgp-stats] Routing Table Report - Japan view

* BGP Routing Table Analysis Reports *
Routing Table Report 04:00 +10GMT Mon 14 Mar, 2011

Report Website: http://thyme.rand.apnic.net
Detailed Analysis: http://thyme.rand.apnic.net/current/

Analysis Summary
----------------

BGP routing table entries examined: 350247
Prefixes after maximum aggregation: 157913
Deaggregation factor: 2.22
Unique aggregates announced to Internet: 173049
Total ASes present in the Internet Routing Table: 36049
Prefixes per ASN: 9.72
Origin-only ASes present in the Internet Routing Table: 31073
Origin ASes announcing only one prefix: 14954
Transit ASes present in the Internet Routing Table: 4976
Transit-only ASes present in the Internet Routing Table: 122
Average AS path length visible in the Internet Routing Table: 4.3
Max AS path length visible: 31
Max AS path prepend of ASN (36992) 29
Prefixes from unregistered ASNs in the Routing Table: 399
Unregistered ASNs in the Routing Table: 182
Number of 32-bit ASNs allocated by the RIRs: 1199
Prefixes from 32-bit ASNs in the Routing Table: 2
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 245
Number of addresses announced to Internet: 2468329760
Equivalent to 147 /8s, 31 /16s and 185 /24s
Percentage of available address space announced: 66.6
Percentage of allocated address space announced: 66.6
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 89.1
Total number of prefixes smaller than registry allocations: 145242

APNIC Region Analysis Summary
-----------------------------

Prefixes being announced by APNIC Region ASes: 87245
Total APNIC prefixes after maximum aggregation: 29757
APNIC Deaggregation factor: 2.93
Prefixes being announced from the APNIC address blocks: 84040
Unique aggregates announced from the APNIC address blocks: 36310
APNIC Region origin ASes present in the Internet Routing Table: 4342
APNIC Prefixes per ASN: 19.36
APNIC Region origin ASes announcing only one prefix: 1194
APNIC Region transit ASes present in the Internet Routing Table: 690
Average APNIC Region AS path length visible: 4.4
Max APNIC Region AS path length visible: 18
Number of APNIC addresses announced to Internet: 595793696
Equivalent to 35 /8s, 131 /16s and 23 /24s
Percentage of available APNIC address space announced: 75.6

APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431
(pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079
55296-56319, 131072-132095
APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8,
49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8,
106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8,
116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8,
123/8, 124/8, 125/8, 126/8, 133/8, 175/8, 180/8,
182/8, 183/8, 202/8, 203/8, 210/8, 211/8, 218/8,
219/8, 220/8, 221/8, 222/8, 223/8,

ARIN Region Analysis Summary
----------------------------

Prefixes being announced by ARIN Region ASes: 140542
Total ARIN prefixes after maximum aggregation: 71719
ARIN Deaggregation factor: 1.96
Prefixes being announced from the ARIN address blocks: 111106
Unique aggregates announced from the ARIN address blocks: 45000
ARIN Region origin ASes present in the Internet Routing Table: 14247
ARIN Prefixes per ASN: 7.80
ARIN Region origin ASes announcing only one prefix: 5420
ARIN Region transit ASes present in the Internet Routing Table: 1473
Average ARIN Region AS path length visible: 4.0
Max ARIN Region AS path length visible: 23
Number of ARIN addresses announced to Internet: 796428032
Equivalent to 47 /8s, 120 /16s and 135 /24s
Percentage of available ARIN address space announced: 63.3

ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106
(pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153
3354-4607, 4865-5119, 5632-6655, 6912-7466
7723-8191, 10240-12287, 13312-15359, 16384-17407
18432-20479, 21504-23551, 25600-26591,
26624-27647, 29696-30719, 31744-33791
35840-36863, 39936-40959, 46080-47103
53248-55295, 393216-394239
ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8,
12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8,
20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8,
29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8,
40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8,
53/8, 54/8, 55/8, 56/8, 57/8, 63/8, 64/8,
65/8, 66/8, 67/8, 68/8, 69/8, 70/8, 71/8,
72/8, 73/8, 74/8, 75/8, 76/8, 96/8, 97/8,
98/8, 99/8, 100/8, 104/8, 107/8, 108/8, 173/8,
174/8, 184/8, 199/8, 204/8, 205/8, 206/8, 207/8,
208/8, 209/8, 214/8, 215/8, 216/8,

RIPE Region Analysis Summary
----------------------------

Prefixes being announced by RIPE Region ASes: 82698
Total RIPE prefixes after maximum aggregation: 47142
RIPE Deaggregation factor: 1.75
Prefixes being announced from the RIPE address blocks: 76009
Unique aggregates announced from the RIPE address blocks: 49908
RIPE Region origin ASes present in the Internet Routing Table: 15410
RIPE Prefixes per ASN: 4.93
RIPE Region origin ASes announcing only one prefix: 7779
RIPE Region transit ASes present in the Internet Routing Table: 2405
Average RIPE Region AS path length visible: 4.6
Max RIPE Region AS path length visible: 23
Number of RIPE addresses announced to Internet: 481096704
Equivalent to 28 /8s, 172 /16s and 244 /24s
Percentage of available RIPE address space announced: 77.5

RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614
(pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631
6656-6911, 8192-9215, 12288-13311, 15360-16383
20480-21503, 24576-25599, 28672-29695
30720-31743, 33792-35839, 38912-39935
40960-45055, 47104-52223, 56320-58367
196608-198655
RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8,
62/8, 77/8, 78/8, 79/8, 80/8, 81/8, 82/8,
83/8, 84/8, 85/8, 86/8, 87/8, 88/8, 89/8,
90/8, 91/8, 92/8, 93/8, 94/8, 95/8, 109/8,
176/8, 178/8, 185/8, 193/8, 194/8, 195/8, 212/8,
213/8, 217/8,

LACNIC Region Analysis Summary
------------------------------

Prefixes being announced by LACNIC Region ASes: 32026
Total LACNIC prefixes after maximum aggregation: 7378
LACNIC Deaggregation factor: 4.34
Prefixes being announced from the LACNIC address blocks: 30914
Unique aggregates announced from the LACNIC address blocks: 16117
LACNIC Region origin ASes present in the Internet Routing Table: 1435
LACNIC Prefixes per ASN: 21.54
LACNIC Region origin ASes announcing only one prefix: 432
LACNIC Region transit ASes present in the Internet Routing Table: 263
Average LACNIC Region AS path length visible: 4.4
Max LACNIC Region AS path length visible: 18
Number of LACNIC addresses announced to Internet: 81368704
Equivalent to 4 /8s, 217 /16s and 150 /24s
Percentage of available LACNIC address space announced: 53.9

LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
262144-263167 plus ERX transfers
LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8,
200/8, 201/8,

AfriNIC Region Analysis Summary
-------------------------------

Prefixes being announced by AfriNIC Region ASes: 7526
Total AfriNIC prefixes after maximum aggregation: 1813
AfriNIC Deaggregation factor: 4.15
Prefixes being announced from the AfriNIC address blocks: 5914
Unique aggregates announced from the AfriNIC address blocks: 1855
AfriNIC Region origin ASes present in the Internet Routing Table: 436
AfriNIC Prefixes per ASN: 13.56
AfriNIC Region origin ASes announcing only one prefix: 129
AfriNIC Region transit ASes present in the Internet Routing Table: 93
Average AfriNIC Region AS path length visible: 5.4
Max AfriNIC Region AS path length visible: 31
Number of AfriNIC addresses announced to Internet: 22037248
Equivalent to 1 /8s, 80 /16s and 67 /24s
Percentage of available AfriNIC address space announced: 32.8

AfriNIC AS Blocks 36864-37887, 327680-328703 & ERX transfers
AfriNIC Address Blocks 41/8, 102/8, 105/8, 197/8,

APNIC Region per AS prefix count summary
----------------------------------------

ASN No of nets /20 equiv MaxAgg Description
4766 2416 9508 892 Korea Telecom (KIX)
7545 1592 301 84 TPG Internet Pty Ltd
4755 1468 653 156 TATA Communications formerly
17974 1399 468 29 PT TELEKOMUNIKASI INDONESIA
24560 1122 324 186 Bharti Airtel Ltd., Telemedia
4808 1046 2142 294 CNCGROUP IP network: China169
9583 1046 76 489 Sify Limited
9829 1005 868 53 BSNL National Internet Backbo
17488 945 162 96 Hathway IP Over Cable Interne
18101 939 117 144 Reliance Infocom Ltd Internet

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-APNIC

ARIN Region per AS prefix count summary
---------------------------------------

ASN No of nets /20 equiv MaxAgg Description
6389 3677 3839 259 bellsouth.net, inc.
4323 2582 1093 402 Time Warner Telecom
19262 1830 4953 282 Verizon Global Networks
1785 1791 681 131 PaeTec Communications, Inc.
6478 1545 299 72 AT&T Worldnet Services
20115 1526 1534 650 Charter Communications
18566 1524 326 180 Covad Communications
7018 1362 6705 888 AT&T WorldNet Services
11492 1313 237 64 Cable One
2386 1291 536 931 AT&T Data Communications Serv

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-ARIN

RIPE Region per AS prefix count summary
---------------------------------------

ASN No of nets /20 equiv MaxAgg Description
6830 515 1780 318 UPC Distribution Services
9198 470 267 15 Kazakhtelecom Data Network Ad
3292 450 1996 389 TDC Tele Danmark
34984 450 95 201 BILISIM TELEKOM
8866 444 133 24 Bulgarian Telecommunication C
20940 411 98 314 Akamai Technologies European
3320 408 7604 354 Deutsche Telekom AG
8551 403 353 46 Bezeq International
12479 402 577 6 Uni2 Autonomous System
8402 401 320 11 Corbina telecom

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-RIPE

LACNIC Region per AS prefix count summary
-----------------------------------------

ASN No of nets /20 equiv MaxAgg Description
10620 1384 258 163 TVCABLE BOGOTA
8151 1243 2700 368 UniNet S.A. de C.V.
28573 1236 961 83 NET Servicos de Comunicao S.A
6503 1179 354 72 AVANTEL, S.A.
7303 919 464 148 Telecom Argentina Stet-France
14420 634 51 88 CORPORACION NACIONAL DE TELEC
22047 541 310 15 VTR PUNTO NET S.A.
3816 511 224 100 Empresa Nacional de Telecomun
11172 488 83 82 Servicios Alestra S.A de C.V
7738 479 922 30 Telecomunicacoes da Bahia S.A

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-LACNIC

AfriNIC Region per AS prefix count summary
------------------------------------------

ASN No of nets /20 equiv MaxAgg Description
8452 793 445 11 TEDATA
24863 773 147 39 LINKdotNET AS number
15475 419 90 8 Nile Online
36992 299 271 14 Etisalat MISR
3741 266 987 228 The Internet Solution
33776 230 13 5 Starcomms Nigeria Limited
24835 228 78 10 RAYA Telecom - Egypt
6713 204 199 11 Itissalat Al-MAGHRIB
29571 192 17 11 Ci Telecom Autonomous system
16637 139 422 84 MTN Network Solutions

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-AFRINIC

Global Per AS prefix count summary
----------------------------------

ASN No of nets /20 equiv MaxAgg Description
6389 3677 3839 259 bellsouth.net, inc.
4323 2582 1093 402 Time Warner Telecom
4766 2416 9508 892 Korea Telecom (KIX)
19262 1830 4953 282 Verizon Global Networks
1785 1791 681 131 PaeTec Communications, Inc.
7545 1592 301 84 TPG Internet Pty Ltd
6478 1545 299 72 AT&T Worldnet Services
20115 1526 1534 650 Charter Communications
18566 1524 326 180 Covad Communications
4755 1468 653 156 TATA Communications formerly

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet

Global Per AS Maximum Aggr summary
----------------------------------

ASN No of nets Net Savings Description
4323 2582 2180 Time Warner Telecom
1785 1791 1660 PaeTec Communications, Inc.
19262 1830 1548 Verizon Global Networks
4766 2416 1524 Korea Telecom (KIX)
7545 1592 1508 TPG Internet Pty Ltd
6478 1545 1473 AT&T Worldnet Services
17974 1399 1370 PT TELEKOMUNIKASI INDONESIA
18566 1524 1344 Covad Communications
4755 1468 1312 TATA Communications formerly
11492 1313 1249 Cable One

Complete listing at http://thyme.rand.apnic.net/current/data-CIDRnet

List of Unregistered Origin ASNs (Global)
-----------------------------------------

Bad AS Designation Network Transit AS Description
15132 UNALLOCATED 12.9.150.0/24 7018 AT&T WorldNet Servic
32567 UNALLOCATED 12.14.170.0/24 4323 Time Warner Telecom
13746 UNALLOCATED 12.24.56.0/24 7018 AT&T WorldNet Servic
32567 UNALLOCATED 12.25.107.0/24 4323 Time Warner Telecom
26973 UNALLOCATED 12.39.152.0/24 7018 AT&T WorldNet Servic
26973 UNALLOCATED 12.39.154.0/23 7018 AT&T WorldNet Servic
26973 UNALLOCATED 12.39.155.0/24 7018 AT&T WorldNet Servic
26973 UNALLOCATED 12.39.159.0/24 7018 AT&T WorldNet Servic
25639 UNALLOCATED 12.41.169.0/24 7018 AT&T WorldNet Servic
13317 UNALLOCATED 12.44.10.0/24 7018 AT&T WorldNet Servic

Complete listing at http://thyme.rand.apnic.net/current/data-badAS

Advertised Unallocated Addresses
--------------------------------

Network Origin AS Description
1.5.0.0/16 38639 NTT Communications Corporatio
1.6.0.0/15 38639 NTT Communications Corporatio
1.8.0.0/16 38639 NTT Communications Corporatio
1.20.0.0/16 38639 NTT Communications Corporatio
1.32.0.0/16 38639 NTT Communications Corporatio
1.37.0.0/16 38639 NTT Communications Corporatio
1.187.0.0/16 38639 NTT Communications Corporatio
14.0.0.0/24 38639 NTT Communications Corporatio
14.0.1.0/24 38639 NTT Communications Corporatio
14.0.2.0/23 38639 NTT Communications Corporatio

Complete listing at http://thyme.rand.apnic.net/current/data-add-IANA

Number of prefixes announced per prefix length (Global)
-------------------------------------------------------

/1:0 /2:0 /3:0 /4:0 /5:0 /6:0
/7:0 /8:24 /9:11 /10:26 /11:73 /12:216
/13:447 /14:768 /15:1371 /16:11567 /17:5672 /18:9351
/19:19032 /20:24643 /21:25244 /22:33536 /23:32017 /24:183008
/25:1133 /26:1329 /27:720 /28:42 /29:9 /30:2
/31:0 /32:6

Advertised prefixes smaller than registry allocations
-----------------------------------------------------

ASN No of nets Total ann. Description
6389 2268 3677 bellsouth.net, inc.
18566 1503 1524 Covad Communications
6478 1499 1545 AT&T Worldnet Services
4323 1391 2582 Time Warner Telecom
10620 1275 1384 TVCABLE BOGOTA
11492 1270 1313 Cable One
7011 1064 1164 Citizens Utilities
1785 1055 1791 PaeTec Communications, Inc.
6503 958 1179 AVANTEL, S.A.
19262 941 1830 Verizon Global Networks

Complete listing at http://thyme.rand.apnic.net/current/data-sXXas-nos

Number of /24s announced per /8 block (Global)
----------------------------------------------

1:271 2:61 4:14 5:1 8:340 12:2025
13:1 14:428 15:15 16:3 17:8 20:9
23:3 24:1516 27:613 31:2 32:60 33:4
34:2 36:2 37:1 38:713 39:1 40:101
41:2313 42:13 44:3 46:671 47:4 49:164
50:201 52:13 55:2 56:2 57:32 58:858
59:495 60:386 61:1135 62:995 63:1923 64:3866
65:2354 66:4344 67:1774 68:1074 69:2893 70:703
71:399 72:2009 73:1 74:2355 75:283 76:341
77:839 78:682 79:446 80:1100 81:818 82:516
83:461 84:643 85:1044 86:515 87:753 88:348
89:1581 90:175 91:3618 92:489 93:1040 94:1218
95:781 96:471 97:251 98:819 99:34 101:61
106:1 107:4 108:129 109:903 110:473 111:715
112:319 113:377 114:497 115:710 116:959 117:674
118:714 119:1035 120:257 121:756 122:1615 123:1038
124:1297 125:1264 128:265 129:168 130:171 131:560
132:109 133:20 134:213 135:49 136:212 137:145
138:298 139:108 140:479 141:203 142:377 143:376
144:491 145:52 146:407 147:201 148:637 149:263
150:159 151:229 152:298 153:180 154:3 155:369
156:179 157:344 158:131 159:373 160:312 161:213
162:277 163:160 164:487 165:351 166:498 167:409
168:728 169:156 170:761 171:69 172:2 173:1264
174:531 175:324 177:35 178:799 180:815 181:4
182:384 183:243 184:233 186:1043 187:837 188:928
189:1032 190:4706 192:5766 193:4792 194:3488 195:2946
196:1208 197:4 198:3578 199:3865 200:5557 201:1577
202:8309 203:8471 204:4106 205:2307 206:2637 207:3052
208:3916 209:3480 210:2688 211:1350 212:1943 213:1719
214:759 215:63 216:4842 217:1652 218:553 219:380
220:1199 221:472 222:319 223:100

End of report
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